题目内容

There is no hospital in the ______area.

A. recent
B. temporary
C. immediate
D. academic

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The answer depends on what kind of system is ______ adopted.

A. ultimately
B. lively
C. seriously
D. comparably

I have a lot of ______ activities,I'm on the school football team.

A. extracurricular
B. historical
C. academic
D. psychological

波源运动时，在波源运动方向前方的波长小，在波源后方的波长大。

A. 对
B. 错

一列火车以20 m/s的速度行驶，若机车汽笛的频率为600 Hz，一静止观测者在机车前和所听到的声音频为______Hz（设空气中声速为340 m/s）。（注意：空处只填准确值数字，不填单位，不填近似值）