在设计机器或部件时,首先画出()。
A.机器或部件的三视图
B.各个零件图
C.装配图
D.边框图
参考答案:C
It was 1969___ the American astronauts succeeded in landing on the moon.
A. that
B. when
C. on which
D. which
具有宣畅气机,清利湿热功用的方剂是
A.平胃散B.一妙散C.三仁汤D.八正散E.五苓散