为什么小绞车严禁无电松车？
参考答案：小绞车无电松车容易发生飞车、断绳、掉道现象，引发事故。
If you had seen Mr. Chang at the meeting, you __ what to do now.
A．would have known
B．would know
C．will know
D．will have known
对球墨铸铁进行高温正火的目的是为了得到下列哪种组织（）
A、F+G
B、F+P+G
C、P+G
D、Ld+G
