单选题：How much do most poorer countries spend on health care per p

题目内容：

How much do most poorer countries spend on health care per person? A． Less than $ 35.
B． About $ 40.
C． More than $ 45.
D． About $ 100.

参考答案：

答案解析：

如图1-1所示，质量为M的物体悬挂在细绳上，细绳跨过定滑轮，另一端系一质量为m的物体，m在水平地面上的位置1处保持静止，

如图1-1所示，质量为M的物体悬挂在细绳上，细绳跨过定滑轮，另一端系一质量为m的物体，m在水平地面上的位置1处保持静止，把m移至2处，仍保持静止，则在两个位置上

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