柏拉图的代表作品是（）。
A.《理想国》
B.《伊安篇》
C.《诗学》
D.《诗艺》
参考答案：A
使用火花间隙检测绝缘子应在什么天气进行？检测前先做什么工作？
It was in the room _______ he was born _______ the meeting was held.
A．that; that
B．which; where
C．where; that
D．where; which
