简述模拟定位机的主要作用?
参考答案:
①模拟各类治疗机的不同条件制定治疗计划。②进行低熔点挡块的验证。③确定靶区或危险器官的运动范围。④勾画射野及摆位参考标记。
如图4-2所示.若某平面任意力系满足∑Fx=0,∑Fv=0,且该力系向C点简化的主矩为MC,求该力系向B点简化的结果()。
A.MB≠MC
B.主矩MB=0
C.主矢F'R≠0
D.主矩MB=MC
—You are very fond of eating barbecued mutton kebabs.
—Yes. Personally,nothing can be________. Would you like one?
A.good
B.well
C.better
D.best