战术训练的中心环节是培养运动员的 ( )
A.竞技战术
B.战术意识
C.战术能力
D.战术行动
参考答案:B
—How I want to have learnt English well when I was at the college.
—If you had, you ______ in the U S A at present. [ ]
A. work
B. worked
C. would work
D. would have worked
电力拖动装置一般由电动机、传动机构、电源三部分组成。