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【单选题】
下列关于活塞环的作用叙述正确的是()。
A.
活塞环按安装位置不同可分为气环和油环
B.
气环主要作用是密封汽缸中的高温高压燃气
C.
气环可在汽缸壁上布上一层均匀的油膜
D.
油环将活塞头部70%~80%的热量传给汽缸壁
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参考答案:
举一反三
【多选题】Usually, you shake your head to mean “No”, but in many parts of India, people shake their heads to mean “Yes”.
A.
Usually
B.
you shake your head to mean “No”
C.
but it/this is not true of the people in many parts of India.
【单选题】Shake firmly, but avoid the “____.”
A.
limp fish
B.
death grip
C.
shake firmly
D.
wave hands
【单选题】You are supposed __ when you meet someone for the first time. [     ]
A.
  shake hands
B.
  to shake hands
C.
shaking hands
【单选题】George _____ have missed the way, I explained the route carefully and drew him a map.
A.
mustn’t
B.
isn't able to
C.
couldn't
D.
may not
【单选题】Englishmen ______.
A.
do not often shake hands with friends when they meet
B.
often shake hands with friends when they meet
C.
do not raise their hats to friends when they meet
【单选题】We can feel the ground ____ when an earthquake happens. [     ]
A.
shaking
B.
shake
C.
shook
D.
to shake
【简答题】Suppose you are going to Boston, and you 1 the city before. If someone 2 you about the interesting places in the city, you like to get some ideas of what you will see. But don't have a clear idea of w...
【判断题】“没戏”是“没有可能;没有希望”的意思。
A.
正确
B.
错误
【简答题】给下列的问句选择合适的答语。 (     ) 1. Do you have a map? (     ) 2. What do you like to do? (     ) 3. Is Li Ming taller or shorter than his father? (     ) 4. Where are the clothes? (     ) 5. What are you doing...
【多选题】鲜味剂按化学成分可以分成()
A.
氨基酸类鲜味剂
B.
核苷酸类鲜味剂
C.
有机酸类鲜味剂
D.
复合鲜味剂
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