A、2 <img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15177952337967f4827427e444219a663bb9c09f955faimage45.png"/>
B、0.5 <img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15177952338611978c6fd533c4db69ce33b6e7bd66e91image45.png"/>
C、5 <img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1517795233931d7df5a21313946658785123e7e16d53dimage45.png"/>
D、10 <img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1517795234012f1d302c96ced4e39aecdcdf4b6fe9794image45.png"/>
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