问题描述：
[单选]
The（）of the lubricant should be sufficient to hold the film together， but it should allow the lubricant to flow easily．
A．specific gravity
B．viscosity
C．acid value
D．calorific value
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答案解析：无
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上一篇：The（）chamber is enclosed between the cylinder head and piston．
下一篇：The（）is not properly set thus causing either advanced or retarded firing．
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