轨枕使用垫板的优点为()三种形式。
A、夹持方便
B、传布压力面积大
C、使两侧道钉同时受力
D、减少摩擦
E、便于保持钢轨的1/40的内倾
参考答案:B, C, E
. The meeting was about to end and everyone was in a hurry to leave when Ted insisted_____
Some questions.
A.on asking
B.to ask
C.asking
D.that he had asked
模板安装作业高度超过( )m时,必须搭设脚手架或平台。
A.1.5
B.2.0
C.2.5
D.1.2