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【简答题】
发动机的预防性维护包括_____维护、_____维护和_____维护。
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反馈参考答案：
举一反三
【简答题】Nanjing is an old city which lies ________ the Yangtze River.
【单选题】The city of Nanjing is _______ the Yangtze River and Japan is_______ the east of China.
A.
in; on
B.
on; to
C.
off; to
D.
on; in
【单选题】Across the Yangtze River _____ more than one bridge, the Nanjing Changjiang Bridge being the first one.
A.
lay
B.
lie
C.
lies
D.
laid
【单选题】______ is the firstself-designed and self-builtdouble-layerbridgein China.
A.
The Qiantang River Bridge
B.
Wuhan Yangtze River Bridge
C.
Nanjing Yangtze River Bridge
D.
Lugou Bridge
【单选题】The Nanjing Yangtze River Bridge is still very strong, ___________ it is almost 43 years old.
A.
although
B.
but
C.
so
D.
because
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