烟火面板上的红黄绿灯分别表示()
A、报警,故障或离线,正常
B、离线或故障,报警,正常
C、正常,离线或故障,报警
D、正常,故障或离线,报警
参考答案:A
—They started working on the show two months ago, didn’t they?
—___________. A lot of work needed to be finished before the show.
A.Yes, they did
B.No, they didn’t
C.Yes, they didn’t
D.No, they did
原油管线自动提取时间比例样时,取样器的最大取样频率为()个/min。
A.10
B.30
C.50
D.80