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【简答题】
在△ABC中角A、B、C的对边分别是a、b、c，若（2b-c）cosA=acosC，则cosA=______．
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举一反三
【单选题】Woman: Do you think Professor Simpson will cancel class on account of the special conference? Man: Not likely. Question: What does the man mean?
A.
He doesn't like the professor very much.
B.
He doubts class will be cancelled.
C.
He doesn't want to attend the conference.
D.
He wonders whether the professor is an actor.
【单选题】Professor Simpson ___________ the project carefully and made a fewcorrections.
A.
went up
B.
went clown
C.
went after
D.
went over
【单选题】Why do the man and woman want to talk to Mr. Simpson?
A.
He is a psychology professor with much knowledge.
B.
His views during arguments are very powerful.
C.
He may be able to add information to a research paper.
D.
He has personal experience in this field.
【简答题】（1）按图测定空气中氧气的含量时，要达到实验目的，反应物或装置方面应满足的条件是 ；该实验还可说明氮气具有的性质是 （要求两条）。 （2）在探究两种未知的银白色金属X和Y的活动性顺序时，某小组同学做了下列实验： ①请你一同完成好如下实验报告，并回答下列问题。 实验步骤 实验现象 结 论 分别把这两种金属放入___________中观察。 金属X无明显变化；金属...
【简答题】传统的集合“并、差、交”运算施加于两个关系时,这两个关系必须 。
【简答题】传统的集合“并、差、交”运算施加于两个关系时,这两个关系必须 。
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