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【单选题】
下列化学消毒剂中,可用于空气消毒的是A.
2%戊二醛
B.
75%乙醇
C.
2%过氧乙酸
D.
3%过氧化氢
E.
0.5%氯己定
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【单选题】The sentence “he was very cautious lest he should be discovered by his wife" implies that ___________.
A.
he was deeply in love with his wife
B.
he hated his wife
C.
he always ignored his wife
D.
he might be afraid of his wife
【简答题】怎样利用积分区域和被积函数的对称性来简化二重积分的计算？
【单选题】He wondered ______ .
A.
what will be his wife's reaction
B.
what would his wife's reaction be
C.
how would be his wife's reaction
D.
what his wife's reaction would be
【单选题】The writer was sorry he made rude remarks because _____ (a)his wife reminded him that he had bought a terrible tie (b)he has a lot of ties (c) his wife has a lot of hats (d)his wife got annoyed with h...
A.
his wife reminded him that he had bought a terrible tie
B.
he has a lot of ties
C.
his wife has a lot of hats
D.
his wife got annoyed with him
【简答题】看图，补全对话。 例: — Did you go swimming? — Yes, I did. 1. — Did you go skating? — __________________________. 2. — Did you ___________________? — __________________________.
【简答题】能否利用对称性来简化第一类曲面积分？
【简答题】When you travel(旅游) in Hong Kong, you must be careful of the traffic(交通) rules, because the traffic keeps to the left and it’s different from that of the interior(内地) of China. Before crossing the str...
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