气缸内的压力超过排气压力的0.3MPa左右,液体从气缸内泄向高压腔,称为()。
A、湿冲程
B、干冲程
C、压缩冲程
D、液击
参考答案:D
下列各句均有一处错误,请选出来并在后面的横线上改正。
( ) 1. They are watch TV in the music room. ________________
A B C
( ) 2. We should keep our classroom cleaning. ________________
( ) 3. Not watch TV at school in the morning. ________________
( ) 4. All of my parents like listening to music. ________________
A B B C
( ) 5. There are not much milk in the milk box. ________________
杂草子实的鉴定一般从哪些方面进行?