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【多选题】
请问大腿细,但小腿粗的女生适合图中哪些牛仔裤款式?A.
图1
B.
图2
C.
图3
D.
图4
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举一反三
【单选题】The successful operation of any engine or machine and its trouble free life depends on ____ which involves the formation and maintenance of a lubricating oil film between the moving parts.
A.
effective cooling
B.
effective lubrication
C.
maintenance
D.
the support
【简答题】保养预防（Maintenance Prive，简称M.P）是将设备改善从（）（Easy Maintenance）演进到一开始就将设备设计成（）（Maintenance Free）。
【单选题】What makes a battery "low maintenance" or "maintenance free"? ( )
A.
Material is used to construct the grids
B.
The plates are constructed or different metals
C.
The electrolyte is hydrochloric acid solution
D.
The battery plates are smaller, making more room for additional electrolytes
【判断题】One of the disadvantages of the timing chain is long-life free maintenance.
A.
正确
B.
错误
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