Discusswithyourclassmateswhetherthereareanyproblemsinthefollowingletterandhowyoucanimproveit.Thencontrastyourimprovedletterwiththeoriginalone.Gentlemen:WearesurprisedthatourorderofMay4forsilkblouseshasnotyetcometohand.Ourcustomersareexpectingthisconsignment.Theycontactuseverydayaskingforanexplanation.Pleaseexpeditethedeliveryofthisconsignmentandinformusofthedateonwhichwecantakethedelivery.Yoursfaithfully,Justin
任意流体在管内流动时,流体速度与管内的截面积成反比。
A. 对
B. 错
稳态流动是指流体在管路中流动时,任一点的流速、压力等有关物理参数都不随时间的变化。
A. 对
B. 错
非稳态流动时,管路上各点的流速压力有关物理量与_____有关,也和_________有关。