未知题型
直径d=0.01m的小球,在静水中以匀速ut=0.4m/s沉降,水温为20℃,试求小球受到的阻力F和小球的比重S。
水温为20℃时,黏滞系数为ν=10-6m2/s。小球下降的雷诺数为......
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未知题型 资本保值增值率等于( )。
单项选择题 We are looking forward to receiving your cable extension of the above L/C thus enabling us to effect shipment of the goods A.out of question B.in question C.in the question D.out of the question
未知题型 风湿性心瓣膜病左房室瓣狭窄最重要的体征是A.二尖瓣面容B.肺动脉瓣区第二心音亢进###SX