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【单选题】
用稀释涂布平板法测定同一土壤样品中的细菌数，在对应稀释倍数为10 6 的培养基中，得到以下几种统计结果，正确的是 [ ]A.
涂布了一个平板，统计的菌落数是230
B.
涂布了两个平板，统计的菌落数是215和260，取平均值238
C.
涂布了三个平板，统计的菌落数分别是21、212和256，取平均值163
D.
涂布了三个平板，统计的菌落数分别是210、240和256，取平均值233
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【单选题】I don't think the explosion happened naturally; I think it was _______ .
A.
manifest
B.
sabotage
C.
withhold
D.
rectify
【简答题】I'm afraid I still don't know anything about the launch. The Marketing Manager gave a presentation about it, but he wasn't very _____ (hesitant/coherent). I don't think he was prepared.
【简答题】______the product promoted in the right way?' 'No, I don't think it was.'
【单选题】I don't think it was an accident. He did it on ________.
A.
choice
B.
purpose
C.
intention
D.
design
【单选题】I don't think it was an accident. He did it _________.
A.
on intention
B.
on purpose
C.
on choice
D.
on design
【简答题】冲压件端面有哪些特征区域?
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