完成句子。

1. If I were you, _____.

2. If we had more time, _____.

3. If I didn't know the meaning of the text, _____.

4. If I were a bird, _____.

5. If I had a better memory, _____.

定时限过电流脱扣器的整定时间通常有0.1(或0.2)、0.3、0.4、0.5s等几种，根据需要确定。其整定时间要比下级任一组熔断器可能出现的最大熔断时间大一个级量。上下级级差不小于( )。

A．0.1～0.2s
B．0.2～0.3s
C．0.15～0.25s
D．0.25～0.35s