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【多选题】
将总体按主要标志进行分组，然后再按随机原则从各组中抽选出样本单位，这种抽样方式是( )。A.
机械抽样
B.
类型抽样
C.
分层抽样
D.
简单随机抽样
E.
整群抽样
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【简答题】This drug is supposed to ________________________ or reduce the efficiency of the reproduction of disease-causing bacteria.
【简答题】In the summer heat, it's easy to develop the embarrassing problem of body odor if you're not careful. Bacteria live all over our skin, and their waste is what causes body odor. Follow these tip...
【简答题】________ The (existence) of disease-causing bacteria in the man's body is him feel extremely ill.
【简答题】MS——DOS操作系统删除子目录的命令是（）。
【单选题】Each of the following statements concerning the killing of bacteria is correct EXCEPT
A.
A 70% solution of ethanol kills more effectively than absolute (100%) ethanol
B.
An autoclave uses steam under pressure to reach the killing temperature of 121℃
C.
The pasteurization of milk kills pathogens but allows many organisms and spores to survive
D.
Iodine kills by causing the formation of thymine dimers in bacterial DNA
【简答题】A stool laboratory ysis includes microscopic examination, chemical tests, and microbiologic tests. The stool will be checked for color, consistency, weight (volume), shape, odor, and the presence ...
【单选题】The bacteria causing gas gangrene is
A.
hemolytic b streptococcus
B.
difficile bacillus
C.
clostridium perfringens
D.
aerogenic bacillus
【多选题】The reason causing "white pollution" is due to ( ).
A.
the properties of synthetic polymer are very stable
B.
we use too many plastics everyday, everywhere
C.
the plastics are hardly digested by bacteria
D.
people litter everywhere and do not recycle correctly
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