A.4.7,0.5,-29.6 B.14.7,0,-19.6 C.24.7,

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问题 A.4.7,0.5,-29.6B.14.7,0,-19.6C.24.7,1.5,-39.6D.34.7,2.5,-9.6

选项 A.4.7,0.5,-29.6
B.14.7,0,-19.6
C.24.7,1.5,-39.6
D.34.7,2.5,-9.6

答案 B

解析 由图知,B的压强即为大气压强,则相对压强为0,A的相对压强为1.5×9.8kPa,C的相对压强为-2×9.8kPA。
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