工质在管道内流动时由于()突然缩小,使工质的压力降低,这种现象称节流。
参考答案:通流截面积
我国某公司出口某产品1000箱,最初对外报价为每箱22美元FOBC3%青岛,国外进口商要求将价格改报为每箱CIFC5%伦敦。已知运费为每箱1美元,保险金额为CIF加成10%,投保一切险,保险费率为0.8%。请计算:
按最初对外报价每箱保险费金额为多少
We’ll continue to learn by ourselves when we have left school, we must _______ learn how to study in the school now.
A.in all
B.after all
C.above all
D.at all