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【简答题】
有一齿轮泵,在齿轮两侧端面间隙 ,转速n=1000r/min,工作压力p=2.5MPa时输出的流量q=20L/min,容积效率 =0.9。工作一段时间后,端面间隙因磨损分别增大为 =0.042mm, =0.048mm,其他间隙不变。
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【单选题】The retiring professor made import ant achi evements in researc h and was __________ by hi s colleagues.
A.
evaluated
B.
ex alted
C.
fascinated
D.
examined
【单选题】( ) is the process to check the ex-import goods in the fields of quantity, quality, package and original place to product, as well as the condition of safety and hygiene.
A.
Commodity inspection
B.
Customs declaration
C.
Examination for the goods
D.
Examination for needs
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