一个防护区或保护对象所用预制灭火装置的要求()。
A、最多不得超过4套
B、宜同时启动
C、动作响应时间差不得大于2s
D、以上只有B、C项符合要求
参考答案:A, B, C
The weather forecast says heavy rain____ to continue this week in many areas, raising the risk of more flooding.
A.is expecting
B.was expected
C.is expected
D.will be expected
导线内径应比接线螺钉直径大2mm。( )