使用氧、乙炔气瓶作业时，气瓶间及气瓶与砂轮机，电气开关等散发火花的地点不得少于（）m。
A.3
B.5
C.4
D.6
参考答案：B
In face of the challenge for the moment, it's most important to ________ a good state of health. [ ]
A. keep up
B. keep away
C. keep off
D. keep out
昏迷患者眼睑不能闭合应
A．局部热敷
B．滴眼药水
C．干纱布覆盖
D．湿纱布覆盖
E．盖凡士林纱布
