题目：
固定牵引
A．将牵引力直接加于皮肤，间接牵拉骨骼
B．在骨骼上穿针将牵引力直接加于骨骼
C．两者均有
D．两者均无
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对解析： A government health study backs up what Mom has said all along, "you should be eating your fruit and vegs". The study says less than a third of Ameri...
