60KG道岔和50KG道岔分别采用()型电动转辙机。
A、ZD6-A型和ZD6-D型
B、ZD6-D型和ZD6-A型
C、ZD6-D型
D、ZD6-A型
参考答案:B
I think he wouldn't come unless he ______. [ ]
A. was inviting
B. was invited
C. invited
D. invites
一般来说,心理咨询对象最好具备下列哪些条件?()
A.具有一定智力基础
B.人格基本健全
C.动机合理
D.有交流能力