C200设备中，可以配置主控板的槽位有（）
A.B1
B.B2
C.A1
D.A2
参考答案：A, B
共济运动的检查方法有
A．指鼻试验
B．跟膝胫试验
C．误指试验
D．快复动作
E．踝阵挛
You have to wash the clothes all by yourself. We're too busy to ______ time to help you. [ ]
A. spend
B. take
C. spare
D. waste
