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【单选题】
The period at high or low water during which there is no apparent change of level is called ().A.
HEIGHT
B.
RANGE
C.
STAND
D.
FALL
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反馈参考答案：
举一反三
【简答题】______ is not only statistical but also interesting.
【单选题】Due to action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.
A.
reciprocating
B.
rotating
C.
running
D.
removing
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