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【单选题】
左心室比右心室壁厚，这是因为左心室（ ）A.
射血速度较快
B.
每搏输出量较大
C.
射出的血液所流经的管道较狭窄
D.
心指数大于右心室
E.
比右心室做更大的博出功
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【单选题】A woman exerts a constant horizontal force on a large box. As a result, the box moves across a horizontal floor at a constant speed vo. The constant horizontal force applied by the woman
A.
has the same magnitude as the weight of the box
B.
is greater than the weight of the box.
C.
has the same magnitude as the total force that resists the motion of the box
D.
is greater than the total force that resists the motion of the box
E.
is greater than either the weight of the box or the total force that resists its motion.