电气上用()三色分别代表L1、L2、L3三个相序。
A.黄、绿、红
B.黄、红、绿
C.红、绿、黄
D.红、黄、绿
参考答案:A
The Chairman seldom talked much at these meetings, but his gestures and noises spoke ______.
A.forums
B.values
C.volumes
D.horrors
YJ29滤嘴接装机为了避免气缸活塞加载时的冲击,在水松纸切刀座下面垫有一弹性的()。