问题描述：
[单选]
The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no（）is found in the water outlet．
A．water
B．oil
C．scale
D．ridge
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答案解析：无
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- 热门题目: 1.经修理的涡轮壳体要经过（）的 2.涡轮壳体局部腐蚀较重，可采用 3.增压器涡轮壳体腐蚀的程度应控