安装刮板输送机刮板链时,有时可以适当增大刮板距。
参考答案:错
What surprised me most was _________ to meet his girlfriend again.
A.not his allowing
B.his not being allowed
C.his being not allowed
D.his having not been allowed
开发者社区能满足开发者哪些需求?()
A.创业致富
B.学习交流
C.获取信息