SQ-80无极绳绞车采用（）传动方式。
A.机械
B.水力
C.液压
D.气压
参考答案：A
Read and write.(请用动词的适当形式填空)
1. Look ! Many people ______ ( swim) in the river.
2.What ______ (do) she ______ (do)?
3. Zhang Peng ______ (buy) some cards two days ago.
4. Where ______ (do) you ______ (go) last weekend?
5. Listen, the train ______ (come).
1235×6788与1234×6789的差值是( )。
A．5444
B．5454
C．5544
D．5554
