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【多选题】
下列关于微生物分离和培养的叙述,正确的是A.
应根据微生物代谢类型选择合适的培养基并控制好培养基的ｐＨ
B.
实验操作时应避免已经灭菌处理的材料用具与周围物品接触
C.
待培养基冷却至室温后，在酒精灯火焰附近倒平板
D.
使用过的培养基应进行高压蒸汽灭菌处理后再丢弃
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皮皮学刷刷变学霸
举一反三
【单选题】What does the author most probably think of the content-based learning?
A.
He doubts it.
B.
He supports it.
C.
He thinks it funny.
D.
He finds it impractical.
【单选题】What does the expression 'fall flat' in the last paragraph probably mean based on the context?
A.
serve their function
B.
fail to take effect
C.
meet the expected demands
D.
dropped down and broken into pieces
【单选题】Based on the figure, does S depend on the frequency of a sound wave of a given intensity?
A.
Yes, because as frequency increases, S increases.
B.
Yes, because as frequency increases, S remains constant.
C.
No, because as frequency increases, S increases.
D.
No, because as frequency increases, S remains
【单选题】A scientist does not accept statements which are not based on the most complete evidence available. Instead, he always checks, studies and makes experiments carefully and objectively to ______ them.
A.
testify
B.
verify
C.
affirm
D.
assert
【单选题】Questions are based on the following passage. 'Innovative' does not necessarily mean radical or expensive， nor do the best ideas comefrom the top. A woman on the shop floor at Ford suggested putting s...
A.
everything that is beneficial to people can be said to be innovative
B.
even the common people can put forward an innovative suggestion
C.
people are easy to accept new things that are helpful to them
D.
the ideas from the top sometimes are not as good as those from ordinary people
【单选题】In a gold-based alloy，copper does which of the following( )
A.
prevents corrosion
B.
increases malleability
C.
increases hardness
D.
A and B
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