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【单选题】
频率为100Hz、波速为200m/s的平面简谐波,波线上距离小于波长的两点振动的相位差为0.5π,则这两点相距A.
0.25m
B.
0.5m
C.
1.0m
D.
1.25m
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反馈参考答案：
举一反三
【判断题】While CSR benefits are hard to quantify, there is no correlation between social/environmental performance and financial performance.
A.
正确
B.
错误
【简答题】There is no doubt that these phenomena are shocking and should arouse our social concern.
【单选题】For them, there is no social life to speak ______. They are too busy.
A.
up
B.
into
C.
of
D.
on
【简答题】For them, there is no social life to speak _______. They are too busy.A. of
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