单项选择题
A.1B.2C.3D.4
A.1倍B.3倍C.5倍D.10倍
A.1倍多B.3倍多C.5倍多D.10倍
A.17~25,40~70B.20~25,40~70C.17~25,30~70D.20~25,30~70
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