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【单选题】
旅客携带品的重量每件不超过( )。A.
5kg
B.
10kg
C.
15kg
D.
20kg
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A.
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B.
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C.
Time devoted to language teaching has never declined.
D.
We should spend more time in learning language than playing chess.
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A.
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B.
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A.
M 1 =M 2 =M 0
B.
M 1 =M 2 =2M 0
C.
M 1 =M 2 =1/2M 0
D.
M 1 +M 2 =2M 0
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