blanching is a process similar to pasteurization but with specific application to vegetables and .
following the blanching step, the vegetable is packaged and the temperature is reduced to .
following the blanching step, the vegetable is packaged and the temperature is reduced to .
most of food processing history is based on of the food product, either to control human health concerns or to extend the product shelf life.
the arrhenius equation and similar expressions are very useful in describing the impact of on the rate of change in product quality during processing and storage.
the main cause of food spoilage is
the purpose of processing is to .
unit operations includes .
food preservation methods includes .
the main purpose of food processing is
general speaking, which can inhibit the growth of microbial reproduction or kill microbes, and slow food decaying chemical or biological metaboli, are referred to as a preservative.
all microbial fermentation is for food preservation.
this general objective implies that the processing operation meets the minimum requirement of ensuring any human health safety concerns associated with microbial activity.
what are the concepts related to food processing in this chapter?and how are the principles of these processing concepts to achieve extended foods shelf-life?
pretreatments are designed to enhance , usually through reduction in the initial microbial content.
the d-value will decrease with increasing .
the temperature increase required to cause a one log cycle reduction in the decimal reduction time is defined as .
thermal processes include .
factors influence the heat resistance of microbial included .
food substrates can be ided into .
when a microbial population in a food is exposed to an elevated temperature, microbial population increased with time.
quality attributes of food are no more resistant to thermal processes than the microbial populations.
the slope of the decimal reduction curve increases as the magnitude of the elevated temperature reduces.
explain the meaning of each symbol in f = nd.
blanching is usually used for food, and pasteurization is usually used for food.
factors affect blanching process not includes:
higher quality attributes could obtained under:
in the processing of pasteurized milk, the minimum processing is to destroy
purpose for pasteurization and blanching includes:
continuous htst blanching system includes:
continuous pasteurization system includes:
usually pretreatments can reduction the initial microbial content .
the two key factors in establishing process time for pasteurization are the length of holding tube and the velocity of the fastest moving particle .
what are the stages of the continuous high-temperature short time pasteurization system?
以下说确的是
以下合法的标识符是
判断变量number是偶数的表达式是
以下运算符优先级最高的是
表达式365 365//10的值是
程序的三种基本结构不包括
以下循环的执行次数是 count=0 while count<=10: print("programming is fun!") count=count 1
以下语句的输出结果是 sum=0 i=1 while i<10: sum=sum i i=i 2 print("sum=",sum)
以下语句的输出结果是 for i in range(5): print(i) print(i)
以下语句打印的星号“*”数量是 for i in range(1,6): for j in range(0,i): print("*",end="") print()
以下程序输出的结果是： def fact(n): s=1 for i in range(1,n 1): s=s*i return s print(fact(4))
下列语句输出的结果是________。 class a: def __init__(self,i): self.i=i def __str__(self): return "a" def __eq__(self,other): return self.i==other.i x=a(1) y=a(1) print(x==y)
下列语句输出的结果是________。 class person: def __getinfo(self): return "person" def printperson(self): print(self.__getinfo()) class student(person): def __getinfo(self): return "student" person().printperson() student().printperson()
下列语句输出的结果是________。 class person: def getinfo(self): return "person" def printperson(self): print(self.getinfo()) class student(person): def getinfo(self): return "student" person().printperson() student().printperson()
使用open(filename,mode)函数打开文本文件时，参数mode不包括________。
下列说确的是________。
文件指针始终指向________。
如果以“w”模式打开一个已存在的文件，则会发生________。
python中所有的异常类都直接或间接继承自________。
下列语句输出的结果是________。 try: list=10*[0] x=list[10] print("done") except indexerror: print("index out of bound")
下列语句输出的结果是________。 try: lst=10*[0] x=lst[9] print("done") except indexerror: print("index out of bound") else: print("nothing is wrong") finally: print("finally we are here") print("continue")
x=[2*x for x in range(10) if x%2==0]，则数组x的元素个数是________个。
下列哪种类型数据是不可变化的________。
字符串的s值的值是"welcome"，则s[2:-2]的值是________。
以下是类a的声明，其中方法__eq__()我们称之为________。 class a: def __init__(self,i): self.i=i def __eq__(self,other): return self.i==other.i
以下说确的是________。
python中的open函数在打开文本文件时不包括以下哪种模式________。
python中的open函数在打开二进制文件时不包括以下哪种模式________。
如果以“w”模式打开一个已存在的文件，则会发生________。
下列不属于python内置异常类的是________。
下列语句输出的结果是________。 try: lst=10*[0] x=lst[10] print("done") except indexerror: print("index out of bound") else: print("nothing is wrong") finally: print("finally we are here") print("continue")