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【单选题】
For a gear pump,A.
as output pressure increases, overall efficiency decreases
B.
as output pressure increases, overall efficiency increases
C.
overall efficiency is not affected by output pressure
D.
none of the above
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【单选题】Mrs. Lackey was awakened by the ringing of the bedside phone 12 hours after her husband's boat had been ______
A.
wrecked
B.
collapsed
C.
decayed
D.
fired
【简答题】完形填空。 Push! At midnight Peter was awakened by heavy knocks on the door. He rolled over and look to his 1 , and it was half past one. 'I'm not getting 2 at this time,' he 3 to himself, and rolled over....
【单选题】Scarcely had he fallen______when a knock at the door awakened him.
A.
sleeping
B.
asleep
C.
sleepy
D.
sleeper
【简答题】读下图,完成下列要求。（每空1分，共7分。） (1)图中数码①代表 板块,②代表 板块;喜马拉雅山脉是由图中板块③与 (板块名称)相撞形成的。 (2)板块构造学说把全球岩石圈分成六大板块,这些板块'漂浮'在软流层上,至今仍在运动。图中字母A处与B处相比,地壳稳定的是 处；板块的边界分为生长边界和消亡边界,C、D板块中位于生长边界的是 。 (3)板块构造理论较好的解释了世界火山和地震多发的两个地带，...
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