电动执行机构按工作方式不同，输出方式有（）。
A.直行程
B.圆周式
C.旋转式
D.单转式
参考答案：A
He seemed to be worried in the waiting room. A bottle of water went from one of his hands to ______. [ ]
A. another
B. others
C. the other
D. the others
构造置换
