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【单选题】
单位时间内流过管道任意截面的流体量称为:A.
流速
B.
流线
C.
流量
D.
流函数
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【单选题】Many early Chinese immigrants worked in the mining industry, especially in the .
A.
copper mines
B.
silver mines
C.
coal mines
D.
gold mines
【单选题】听力原文：M: In the early 1860's many more Chinese arrived in California. Was there any improvement for Chinese's living conditions? F: Oh, no. This time the men were imported as work crews to construct th...
A.
in the early 1850's.
B.
in the late 1850's
C.
in the early1860's.
D.
in the late 1860's.
【单选题】Many early Chinese immigrants worked in the mining industry, especially in the _____.
A.
gold mines
B.
silver mines
C.
coal mines
D.
copper mines
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