【单选题】【消耗次数：1】
函数在处可微是在处可导的()条件
①
充分
②
必要
③
充要
④
无关的
参考答案：
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17._____ of English is essential for those who apply for the post.
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Good knowledge
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A good knowledge
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Good knowledges
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The good knowledge
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5. As he is recovering, he has grown more confident and _______ about life.
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pessimistic
②
positive
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negative
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interested
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8.She no longer has that______ smile as before, but instead carries the sad look of a mother who has just lost her son.
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careless
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carefree
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interested
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sick
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15. He was determined to cross _____of the Atlantic Ocean by sailing westwards.
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dangerous water
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the dangerous water
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the dangerous waters
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dangerous waters
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25. I object ________ being kept waiting. Why are you always late ________ appointments?
①
/;for
②
to; for
③
in; for
④
to; in
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more interested
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more interesting
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as interested
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5.Ten minutes later a taxi ______ in front of the house, where we had arranged to meet.
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pulled out
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. pulled up
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pulled down
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pulled off