癔症性痉挛下列哪项是错误的()
A.发作时无固定先兆
B.无舌咬伤及尿便失禁
C.抽搐时间一般比癫痫短
D.发作时瞳孔不散大
E.一般无面色发绀
参考答案:C
Military helicopters dropped food and medicine to the earthquake survivors that remained ________ in remote mountain villages.
A.cut off
B.paid off
C.put off
D.laid off
天然气的爆炸上下限范围是()
A、2%~10%
B、10%~20%
C、5%~15%
D、20%~50%