摊铺机用其他车辆牵引时，只允许用（）。
A.弹性拖杠
B.刚性拖杠
C.钢丝绳
D.钢绞线
参考答案：B
Tom had his bad tooth ________ yesterday.
A．put out
B．to put out
C．pulled out
D．to pull out
颞下颌关节上腔穿刺成功的标准是________。
