转8A型转向架三角孔的作用是()。
A、减轻重量
B、便于清砂
C、便于检修闸瓦及减轻重量
D、增加外形美观
参考答案:C
工作协作关系包括哪两个部分()
A.对内和对外
B.学历要求和专业职称
C.共醉时间和工作环境
D.无
—Could you tell me __________?
—Certainly. In half an hour.
A.when will the train to Beijing leave
B.when the train to Beijing would leave
C.when the train to Beijing left
D.when the train to Beijing leaves