同离心通风机一样，离心泵也是利用（）使流体产生运动。
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钢制品在基准温度为（）℃时的耐压强度称为公称压力。
A. 100
B. 120
C. 200
D. 300
易腐货物容许运输期限须大于铁路规定的运到期限（）日以上。
A. 1
B. 2
C. 3
D. 5
矿浆准备器上大口径的入料管是进清水和滤液，小口径入料管是进矿浆。
A. 正确
B. 错误
The height of tide is the （）.
A. depth of water at a specific time due to tidal effect
B. difference between the depth of the water and the area's tidal datum
C. difference between the depth of the water and the high water tidal level
D. difference between the depth of the water at high tide and the depth of the water at low tide
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