A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1517795230954b025b934edec418f9d98d63e25a08d75image24.png">
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1517795231019f251f17777f84c4ca1f161bf7fe08d81image25.png">C. <img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15177952310915295b3edb8364562b665f16fb310489cimage26.png">
C、2s
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