采煤工作面刮板输送机严禁（）。
A．乘人
B．运物料
C．运矸
参考答案：A
Was it ______ the international conference that made the city the focus of this area? [ ]
A. held
B. hold
C. holding
D. being held
下列哪种并发症不可能发生于骨折晚期（）
A.骨化性肌炎
B.骨缺血性坏死
C.创伤性关节炎
D.关节僵硬
E.脂肪栓塞
