重度脱水与中度脱水主要区别为()
A.尿量减少
B.眼眶凹陷
C.皮肤弹性差
D.代谢性酸中毒
E.周围循环衰竭
参考答案:E
The grab rail of a metal lifeboat is normally located().
A.along the turn of the bilge
B.along each side of the keel
C.near the top of the gunwale
D.at the bow and at the stern
对于要求较精细的工件,可以采取()打磨。
A、干法
B、湿法
C、机械