问题描述：
[单选]
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．
A．strength
B．dense
C．percentage
D．velocity
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：When turning the engine with turning gear， you should keep the indicator cocks（）．
下一篇：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．
- 我要回答: 网友(3.144.255.158)
- 热门题目: 1.柴油机说明书规定的定期吊缸检 2.拆卸机器时不必（）。 3.关于吊缸拆卸顺序，不正确的操