开关柜交接试验，24kV真空断路器合闸弹跳时间不应大于（）ms。
A.1
B.2
C.3
D.4
参考答案：B
—I called you last night, but no one answered me.
—Oh, I________ a shower.
A．have taken
B．was taking
C．took
D．will take
洪水型钩体病的主要传染源是
A．鼠
B．鹅
C．蛙
D．鸭
E．猪
