题目内容

A．wonB．lostC．gainedD．found

A. won
B. lost
C. gained
D. found

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A．turnedB．cameC．wentD．seemed

A. turned
B. came
C. went
D. seemed

A．losingB．retiringC．gettingD．quitting

A. losing
B. retiring
C. getting
D. quitting

超声波是比声波振动频率更高的波，检测中常用的是()MHz的超声波。

A. 1～2
B. 1～3
C. 1～4
D. 1～5

A．tradeB．truthC．lieD．lies

A. trade
B. truth
C. lie
D. lies