前轮停转动力来源于（）
A、液压系统A
B、液压系统B
C、储压器
D、弹力
参考答案：D
以下不属于解溪穴主治的是（）。
A.下肢痿痹
B.头痛，眩晕，癫狂
C.腹胀，便秘
D.失眠
E.踝关节病，垂足
Helen hurt her leg while _____ on the playground. We had to send her to the hospital. [ ]
A. played
B. playing
C. was playing
D. is playing
