总配线架正面上部装有列信号灯、告警信号盘和()。
A.地线铜条
B.地线铝条
C.地线铁条
D.地线钢条
参考答案:A
It is still under discussion ________the old bus station should be replaced with a modern hotel or not.(2011·重庆)
A.whether
B.when
C.which
D.where
我国开工建设的第二条海底隧道——青岛胶州湾隧道何时正式动工建设?