A.More "wandering" occurs in the jet stream than would probably occur over the ocean.
B.The continent in question heats and cools at a faster rate than it would without the jet stream.
C.The jet stream becomes more narrow and focused than it would be over the ocean.
D.The temperature of the jet stream is distributed more evenly than if the continent had more mountains.
E.The jet stream evinces more signs of being a thermally driven phenomenon than it does in other situations.
第1题
环槽端面磨损使______增大,使活塞环的密封性下降,产生漏气和降低压缩压力等问题。
A.活塞与气缸间隙
B.平面间隙
C.搭口间隙
D.环槽高度
第2题
环槽端面磨损使_______增大,使活塞环的密封性下降,产生漏气和降低压缩压力、爆发压力等问题
A.活塞与气缸间隙
B.平面间隙
C.搭口间隙
D.环槽高度
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