下列关于货物装载重心位置的说法，正确的是（）
A.重心位置应尽可能高
B.重心位置越高转弯时越容易翻车
C.只要不超载重心位置不重要
参考答案：B
平面汇交力系最多可以求解（）未知数。
A.一个
B.两个
C.三个
D.四个
The nurse is developing a teaching plan for a client with diabetes mellitus. A client with diabetes mellitus should （）.
A．use commercial preparations to remove corns.
B．cut toenails by rounding edges.
C．wash and inspect feet daily.
D．walk barefoot at least once each day.
