---How was the weather then?

---Hardly _____ off the plane when it started to rain.

A．I had stepped

B．had I stepped

C．I stepped

D．did I step

管道正常运行后应按日常检查或巡线检查，在安全附件方面，应重点检查（）。

A.工作温度是否正常

B.操作温度

C.有无渗漏

D.减压装置是否完好