控制纤维层的厚度，无法控制滤布的空隙和密度。
参考答案：错
_____no point in beating around the bush. Let’s ________.
A．It’s ; come straight to the point
B．There’s; come to the point
C．This is; get to the point
D．That is; reach the point
牵引发电机滑环出现火花时如何处理？
