断路器液压机构在压力下降过程中，依次发“压力降低闭锁重合闸”、“压力降低闭锁合闸”、“压力降低闭锁跳闸”信号。
参考答案：对
The manager asked the man ______. The man said yes.
A．what the story was about
B．when the story happened
C．if the story was true
D．who told him the story
下列实验过程中产生的现象与对应的图形正确的是（ ）
A．
盐酸中加入Na[Al（OH）4]溶液
B．
SO2通入溴水中
C．
向Na2CO3溶液中逐滴滴加HCl
D．
氨气通入醋酸溶液
