万向轴组装后必须进行（）试验。
A.扭转
B.剪切
C.压力
D.动平衡
参考答案：D
Someone called me up in the middle of the night, but they hang up ____ I could answer the phone.
A．since
B．after
C．until
D．before
简述级配碎石集中厂拌法施工纵向接缝处理方法及要点？
