船舶进厂修理首先要注意安全，主要的安全措施应从（）考虑。
A.防火，防坠落
B.安全用电
C.防滑和防冻
D.A+B+C均是
参考答案：D
---The TV show Dad, Where Are We Going is so wonderful. You shouldn’t miss it.
---If I have time, I it.
A．see
B．am seeing
C．will see
D．saw
哪些原因压缩机必须紧紧停车？
