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【单选题】
安装新的活塞环时应______,以保证活塞环正常工作。1.采用专用工具2.修锉搭口3.新环装在第一、二道环槽4.错开各环开口位置;5.确定下端面。A.
①②④
B.
①④⑤
C.
②③⑤
D.
①③④
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皮皮学刷刷变学霸
举一反三
【单选题】When the Japanese yen appreciates, then we might expect (everything else equal) that imports in Japan will______and exports will______.
A.
rise...fall
B.
rise...rise
C.
fall...fall
D.
fall...rise
【简答题】_________(确实) these changes take a long time,________(但是) not as long as we might expect.
【判断题】Theories describe the relationship we might logically expect between variables.
A.
正确
B.
错误
【简答题】阅读理解。 Mary and Peter were having a picnic with some friends near a river when Mary notice an object overhead. 'Look!' she shouted to her friends. 'That's a spaceship up there and it's going to land he...
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