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【判断题】
重量法测定悬浮物的原理是水样经过滤不能通过0.45μm滤膜的固体物质，经103～105℃烘干至恒重得到的不可滤残渣质量。A.
正确
B.
错误
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举一反三
【单选题】What should be done with the crankcase?
A.
The crankcase should be heated up.
B.
The crankcase should be sealed up.
C.
The crankcase should be vented.
D.
The crankcase should be clear of obstacles
【单选题】某产品售价 200 元,单位变动成本 160 元,固定成本总额为 100 000 元,预计销售量为 5 000 件,则安全边际率和边际贡献率分别为( )
A.
100%、20%
B.
100%、80%
C.
50%、20%
D.
200%、20%
【单选题】某产品售价200元,单位变动成本160元,固定成本总额为 100 000 元,预计销售量为5 000件,则安全边际率和边际 贡献 率分别为( )。
A.
100%，20%
B.
100%，80%
C.
50%，20%
D.
80%，20%
【单选题】某产品单位售价200元,单位变动成本160元,固定成本总额为100 000元,预计销售量为5 000件,则安全边际率和贡献边际率分别为( )。
A.
100%，20%
B.
100%，80%
C.
50%，20%
D.
200%，20%
【单选题】If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?
A.
The cylinder indicator cocks should be opened
B.
The sump lube oil scavenge pump should be secured immediately
C.
The explosion relief valves should be manually opened
D.
The crankcase should remain unopened until the engine has cooled
【单选题】How dose water enter the crankcase of a diesel engine?
A.
Through the crankcase exhauster
B.
As water vapor contained in blow-by
C.
Demulsifying lube oil passing through the main bearings
D.
Condensation from vapor formed in the expansion tank
【单选题】The blower type crankcase ventilation system （）
A.
removes combustible gases in the crankcase
B.
prevents the formation of combustible gases in the crankcase
C.
cools lubricating oil
D.
improves cold weather starting
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