the basic unit of materials is_____, which can bond directly together to form materials, or convert into ions, or assemble into molecules.
crystalline structure is a description of the ordered arrangement of atoms, ions or molecules in a crystalline material. we often use ____to illustrate the 3d structure, which is an array of 'all boxes' infinitely repeating in three spatial directions.
the sequence of different scales is macro, mini, meso, ______, nano and atomic.
metallic materials are mostly ______ in nature.
steel is actually an alloy of _____ and _____.
the majority of metal has a tendency to change into ______ gradually, except several noble metals, due to the exposure to the environment.
because of the strong bonding, metallic materials usually have high packing density. typical lattice structures of metals include _____, _____ and _____ structure.
the standard electrode potential of different metals in an aqueous solution could approximately show their thermodynamic stability.
the cathodic reaction is probably oxygen reduction reaction (orr) when steel is corroded in an acid aqueous solution
______is not the property of inorganic non-metallic materials.
which is not correct?
______are the chemical bonds in inorganic non-metallic materials.
choose the general properties of ceramics from the following
the glass have various colors because they contain different metals or rare earth metals.
inorganic non-metallic materials have higher thermal conductivity than metals.
______is not the polymer material.
______is the characteristic unit of polymer structure.
choose the characteristics of copolymers from the following options.
______are the possible features of polymer materials.
the components of a species ab in an addition reaction are added to adjacent atoms of a single bond.
crystallization occurs above the glass transition temperature (tg) and below the melting temperature (tm).
which one has a larger coecivity?
how can we classify the materials based on the susceptibility?
the magnetic moments in a domain are arranged in the same direction.
the energy issues don’t include ______
______ are advantages of renewable energy
______ are disadvantages of renewable energy
______ are belonging to energy storage battery.
______are characteristics of li-ion batteries.
______ are reasons for choosing li as an important battery material.
fuel cell can convert chemical energy to electrical energy.
energy can be created or destroyed.
______ are strategies for developing wide-gap thermoelectrics
______are the selection rules of highly effective thermoelectrics.
thermoelectric phenomenon can be applied in electronic cooling.
compared to bulk materials and other nanomaterials, graphene has the following advantages: ______.
generally, there are two different strategies to get ultrathin 2d materials: ________method and _________ method.
which phenomena is about energy conversion between mechanical energy and electrical energy?
______is the characteristic unit of polymer structure.
______is not the polymer material.
the energy issues don’t include ______
______are not characteristics of li-ion batteries.
crystalline structure is a description of the ordered arrangement of atoms, ions or molecules in a crystalline material. we often use ____to illustrate the 3d structure, which is an array of 'all boxes' infinitely repeating in three spatial directions.
steel is actually an alloy of _____ and _____.
based on the inserted table of standard electrode potentials of metals, it could be inferred that ______ shows higher thermodynamic activity in aqueous solution at 25°c.
the ision of soft magnetic materials and hard magnetic materials is based on _______.
______ are belonging to energy storage battery.
______ are advantages of renewable energy.
metallic materials are mostly crystalline in nature. because of the strong bonding, metallic materials usually have high packing density. typical lattice structures of metals include _____, _____ and _____ structure.
generally, there are two different strategies to get ultrathin 2d materials: ________method and _________ method.
there are usually two ways to make flexible electronics, which are _____ and _______.
the magnetic materials can be classified into _______________.
magneti of the materials comes from ____________.
crystallization occurs above the glass transition temperature (tg) and below the melting temperature (tm).
the sequence of different scales is macro, mini, micro, meso, nano and atomic.
the cathodic reaction is probably hydrogen evolution reaction (her) when steel is corroded in a neutral aqueous solution.
the chiral molecule can have only one chiral center.
what are the characteristics of strong magnetic materials?
gamma purchases a motor vehicle on 30 september 20x1 for $15,000 on credit. gamma has a policy of depreciating motor vehicles using the reducing balance method at 15% per annum, pro rata in the years of purchase and sale. what are the correct ledger entries to record the purchase of the vehicle at 30 september 20x1 and what is the depreciation charge for the year ended 30 november 20x1? purchase of motor depreciation charge vehicle on 30.9.x1 for year ended 30.11.x1
向量(1, 1, 1)与向量(1, -1, 1)的向量积 =
对于朗伯体，辐射出射度与辐亮度存在的倍数关系为：
eprom是指()
at the end of its first trading period after commencing business, khan & co has a receivables balance of $500,000. it wishes to provide a specific allowance on a debt of $10,000. (the customer that owes this $10,000 is in severe financial difficulty, it is unlikely any of this $10,000 will be recovered). khan & co also wishes to set up a general allowance of 2%. what is the charge to the statement of profit or loss?
三个变量a，b，c一共可以构成()个最小项
直角坐标系中，向量(1,2,3)在单位向量(0,1,0)方向上的分量为
the closing inventory at cost of a company at 31 january 20x3 amounted to $284,700. the following items were included at cost in the total: 1 400 coats, which had cost $80 each and normally sold for $150 each. owing to a defect in manufacture, they were all sold after the reporting date at 50% of their normal price. selling expenses amounted to 5% of the proceeds. 2 800 skirts, which had cost $20 each. these too were found to be defective. remedial work in february 20x3 cost $5 per skirt, and selling expenses for the batch totalled $800. they were sold for $28 each. what should the inventory value be according to ias 2 inventories after considering the above items?
用rom实现四位二进制码到四位循环码的转换，要求存储器的容量为()。
alana is not registered for sales tax purposes. she has recently received an invoice for goods for resale which cost $500 before sales tax, which is levied at 15%. the total value was therefore $575. what is the correct entry to be made in alana's general ledger in respect of the invoice?