手提式压力灭火器的压力指示针指在（）表明压力正常。
A.红区
B.绿区
C.黄区
D.蓝区
参考答案：B
The memory of the holiday spent in Europe with her husband will _____ all through her life.
A．stay
B．live
C．leave
D．impress
输煤管道堵塞的象征、原因有哪些？怎样处理？
