手杖两点步行
参考答案：
同时伸出手杖和患足并支撑体重，再迈出健足，手杖与患足作为一点，健侧足作为一点，交替支撑体重的步行方式。
My command of English is not ____ yours. [ ]
A. as half as
B. so half good as
C. good as half as
D. half so good as
列车制动机简略实验有哪些技术要求？
