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【简答题】
（1）3.01×10 24 个微粒，其物质的量是______mol． （2）O 2 和O 3 混合物64g，其氧原子物质的量是______mol． （3）在标准状况下，氢气和氧气混合气体67.2L，其物质的量是______mol． （4）有一瓶浓度为4mol/L体积为250mLNa 2 SO 4 溶液，Na + 物质的量是______mol．
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举一反三
【单选题】An agency relationship exists when one party delegates
A.
decision-making responsibility to a second party
B.
financial responsibility to employees
C.
strategy implementation actions to functional managers
D.
ownership of a company to a second party
【简答题】我国重要的粮食、糖料作物和蚕丝基地是（ ）。
【单选题】When an acquisition or merger is not desired by one party, it is called:
A.
takeover
B.
forward integration
C.
backword integration
D.
joint venture
【简答题】我国重要的豆类作物栽培种有：()等。
【单选题】I have some difficulties __these words．Would you mind __ me your dictionary?
A.
understanding, lending
B.
to understand, to lend
C.
to understand, lending
D.
understanding, to lend
【简答题】简述 (磁盘的)数据传输率
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