为提高主断路器分闸控制可靠性，由自动开关（）单独提供。
A、7ZK
B、2ZK
C、3ZK
D、4ZK808
参考答案：B
--- Where did you spot the murderer?
--- It was in the cinema __________ we watched Tran formers that I saw him. I can’t remember when.
A．that
B．when
C．where
D．on which
风量变化对过热器温有何影响？
