单项选择题
A.50B.80C.100D.120
A.0.5B.1C.1.5D.2
A.0-+0.2B.0-+0.3C.0-+0.4D.0-+0.5
A.+0.2,0B.+0.2,-0.1C.+0.3,+0.1D.+0.3,0
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