皮皮学，免费搜题
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【单选题】
小学儿童的同伴交往的一个重要特点是A.
开始建立友谊关系
B.
还没有形成同伴团体
C.
与同伴交往的时间减少了
D.
与成人的交往的时间多了
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【单选题】Fresh Water Shortage A water crisis is about to explode. Fresh water is a finite resource. The amount of fresh water supply provided by the hydrological cycle does not increase. Water everywhere on th...
A.
Y
B.
N
C.
NG
【单选题】Fresh water is used for the cooling of the cylinder jackets and _____of the main engine.
A.
cylinder covers
B.
crosshead
C.
exhaust manifold
D.
main bearing
【单选题】Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.
A.
cylinder covers
B.
lubricating space
C.
crosshead
D.
exhaust manifold
【单选题】Fresh water is used for cooling of cylinder jackets and _____ of the marine diesel engine.
A.
Cylinder covers
B.
Lubricating space
C.
Crosshead
D.
Exhaust manifold
【单选题】（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.
A.
The fuel oil
B.
The lube oil
C.
The sea water
D.
The fresh water
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