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【单选题】
关于波的叠加和干涉,下列说法中正确的是 ( )A.
两列频率不相同的波相遇时，因为没有稳定的干涉图样，所以波没有叠加
B.
两列频率相同的波相遇时，振动加强的点只是波峰与波峰相遇的点
C.
两列频率相同的波相遇时，如果介质中的某点振动是加强的，某时刻该质点的位移s可能是零
D.
两列频率相同的波相遇时，振动加强的质点的位移总是比振动减弱的质点的位移大
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举一反三
【单选题】Over two thirds of the population were believed to have no ______ to the health care in the west rural area in China.
A.
aid
B.
basis
C.
belief
D.
access
【简答题】（1）（﹣3）+（﹣4）﹣（+11）﹣（﹣9）= _________ （2）（﹣7）×（﹣5）﹣90÷（﹣3）= _________ （3） = _________ （4） = _________
【单选题】____________of the news reports _________written in English on the Internet.
A.
Two thirds, are
B.
Two-thirds, is
C.
Two third, are
D.
Second thirds, is
【单选题】As a result of the policy ______.
A.
two thirds of mayors are now college graduates
B.
over 20% of eligible East German women still have no jobs
C.
two thirds of East German women go out to work
D.
two thirds of East German doctors, judges are men
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