When two oil separators are working in series, they should work with （） ["both as clarifiers","first one as clarifiers, second one as purifier","both as purifiers","first one as purifier, second one as clarifier"]
（）期是指稻穗从顶端茎鞘里抽出到开花齐穗这段时间，一般5-7天。
为及时、妥善处置银行营业场所重大突发事件，切实防范和化解突发事件给银行带来的风险，维护银行和社会稳定，银行营业场所发生突发事件要实行严格的（）制度。 ["监督","报告","奖惩","跟踪调查"]
Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（） ["the plant should be prohibited to supplying air","the plant should work at intervals","the plant should be added disinfector in time","we should check strength of activated sludge, ivory-white color is best"]
在进行时间优化时，缩短关键路线上活动时间的途径有（）。 ["A.利用平行、交叉作业缩短关键活动的时间","B.在非关键路线上赶工","C.在关键路线上赶工","D.采用新技术缩短工作时间","E.进一步压缩最短路线上的工作时间"]
（）期是指幼穗分化到抽穗这一段时间，一般需一个月左右。
