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【单选题】
常用于检测人体活动的传感器为( )A.
震动传感器
B.
温湿度传感器
C.
红外热传感器
D.
烟雾传感器
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反馈参考答案：
举一反三
【简答题】平行单色光垂直入射到平面衍射光栅上,若增大光栅常数,则衍射图样中明条纹的间距将 ,若增大入射光的波长,则明条纹间距将 。 (两空都填“增大”、“减小”或者“不变”)
【单选题】—God！My cell phone is missing. —You ________ have left it at home.I heard you telephone our daughter in the bathroom.
A.
shall
B.
must
C.
would
D.
could
【单选题】—Why! Where’s my mobile phone? Maybe I left it on the plane. —My goodness! You things behind.
A.
haven’t left
B.
didn’t leave
C.
had never left
D.
never leave
【单选题】A I was waiting for a phone call from my agent. He had left at message the night before, telling me that my show was to be cancelled. I called him several times, but each time his secretary told me th...
A.
He was mad at the telephone.
B.
He was angry with his agent.
C.
He was anxious about his wife.
D.
He was impatient with the secretary?
【单选题】My mobile phone disappeared. Where _____ I have left it?
A.
may
B.
must
C.
could
D.
should
【单选题】平行单色光垂直入射到平面衍射光栅上,若光栅常数从每毫米500条变成每毫米600条,则衍射图样中明条纹的间距将 ,若入射光从黄光变成红光,则明条纹间距将 。
A.
（1）增大 （2）增大
B.
（1）增大 （2）减小
C.
（1）减小 （2）增大
D.
（1）减小 （2）减小
【多选题】平行单色光垂直入射到平面衍射光栅上，下列说法正确的是:
A.
若增大光栅常数，则衍射图样中明条纹的间距将变大
B.
若增大光栅常数，则衍射图样中明条纹的间距将变小
C.
若增大入射光的波长，则明条纹间距将变小
D.
若增大入射光的波长，则明条纹间距将变大
【简答题】I was waiting for a phone call from my agent. He had left a message the night before, telling me that my show was to be cancelled. I called him several times, but each time his secretary told me that ...
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