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【单选题】
根据GB 4789.4-2016，如下哪个步骤是采用选择性平板分离法，用能抑制非沙门氏菌生长的固体选择性培养基，提供肉眼可见的疑似沙门氏菌纯菌落的识别。A.
样品制备
B.
预增菌
C.
选择性增菌
D.
细菌分离
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反馈参考答案：
举一反三
【简答题】（ ）What do mobile phone companies say about their business?
【单选题】It is ridiculous _____ school administrators say is always in disagreement _____ what they do in practice. [ ]
A.
what ; with
B.
what ; to
C.
that what; with
D.
that what; to
【简答题】只有在到期日才能行使的期权被称为_______期权。
【单选题】What did the guards do when Peter started gathering the money?
A.
They let him do what he wanted to.
B.
They called the police.
C.
They helped him find large bills.
D.
They pressed the alarm.
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