用于民用建筑终端用户插座回路的低压断路器应为( )。
A.单相单极
B.单相双极
C.单相三极
D.双相单极
参考答案:B
—_____ notebook is that?
—It could be _____, she likes books in pink. [ ]
A. Whose; Mary's
B. Whose; Mary
C. What; Mary's
预想故障分析是针对预先设定的()的故障及其组合,确定其对系统安全运行的影响。