起升机构的吊钩上滑轮直径比卷筒直径小,所以钢丝绳在滑轮处的损坏就小。()
A、正确
B、错误
参考答案:B
找出错误的单词,并改正。
"Let's play pogn-ping! We eend some eggs. I can echta you!" said David Diffo. They tnew to the store and
hbtugo some eggs. "Do you have nay eggs?"
ping-pong 1. 2.
3. 4. 5.
检查机构认可概述。