简述危险固体废物的危害特性？
参考答案：
急性毒性、易燃性、腐蚀性、反应性、放射性、浸出毒性
Brown said he was by no means annoyed；________he was glad to be able to make himself clearly understood. (2012·浙江，14)
A．all in all
B．for one thing
C．on the contrary
D．by the way
220kV的电气设备，在不停电情况下工作时，其安全距离为（）。
A.1m
B.1.5m
C.3.0m
D.3.5m
