has not / does not /fails to /was not 中文如何区别? 2.if the valve does not confirm open in a reasonable time,steam is established to the oil pipe. 如果阀门在一定时间内无法确认是否打开,可以向油管内输送蒸汽。 4.but the trip may not have occurred if the valve was not confirmed open. 如果经确认阀门没有打开,那么联锁起跳就不可能发生。 5.the valve is confirmed open. 确认阀门打开。 the valve is not confirmed open. 未确认阀门是否打开/确认阀门未打开(我不知道用哪个更准确) the valve is confirmed open 现场操作人员怎么讲 经确认,阀门已经打开 不知道合适不?查看更多