题目内容

My sister______to see me . She will be here soon.

A. comes
B. is coming
C. had come
D. came

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They said they______our answer the next day .

A. had heard
B. would hear of
C. would hear
D. will hear

The old man said that light______faster than sound.

A. went
B. will go
C. travels
D. will travel

信号频率覆盖500Hz~50kHz，应选用______滤波器。

A. 带通
B. 高通
C. 低通
D. 带阻

有一图纸量得某线段长度为5.34cm，当图纸比例为1：30时，该线段实际长度是（）米。

A、160.2
B. 17.8
C、1.062
D、16.02