链传动装置不适在（）的传动中应用。
A、负荷变化大
B、需急速反转
C、高速
D、A＋B＋C
参考答案：D
A TV star invited his girlfriend onto his show. He wanted to play a ________ on his girlfriend, but he
fooled himself. [ ]
A. hoax
B. joke
C. play
D. game
左旋多巴的作用是：
A．促进DA神经元释放DA，抑制DA摄取B．激动DA受体C．在脑内转变为DA，补充纹状体中DA不足D．阻断中枢胆碱受体E．兴奋中枢胆碱受体
