问题描述：
[单选]
When the starting air valve closes on one cylinder， another starting air valve has（）opened on another cylinder whose piston has just commenced its downward stroke．
A．just
B．nearly
C．merely
D．already
参考答案：查看无
答案解析：无
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答案解析：无
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上一篇：When to remove scale from the cooling spaces， acid solution（）in the system can be tested from time to time by putting some on to a piece of lime．
下一篇：When the order（）is received from the bridge， the main air stop valve in the starting air line should be shut．
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