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【单选题】
两重块A和B相叠放在水平面上，如图a所示。已知A块重W1=0.5kN，B块重W2=0.5kN，A块与B块间的摩擦因数为fs1=0.25，B块与水平面间的摩擦因数fs2=0.20，试求拉动B块所需的最FP的值。【图片】A.
0.08 kN
B.
0.11 kN
C.
0.14 kN
D.
0.2 kN
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【单选题】有关阑尾的描述，正确的是( )
A.
动脉来自肠系膜下动脉
B.
阑尾根部是三条结肠带集中处
C.
阑尾附于结肠起始部
D.
经阑尾孔开口于盲肠下端
E.
位于右髂窝，是腹膜间位器官
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