加弹机假捻锭组盘间距超差，调整方法正确的是（）。
A.将导入、导出盘互换安装
B.更换假捻捻向
C.紧固松动隔套
D.以上调整方法均不正确
参考答案：C
公路隧道结构构造，由主体构造物和()两大类组成。
A.岩层
B.明洞
C.承台
D.附属构造物
— Mr. Smith joined in different activities in Beijing. Do you know ___________?
— Since 5 years ago.
A．when he went there
B．how long he has stayed there
C．how soon he will come back
D．when he will come here
