How would the exhaust of a properly operating diesel engine appear?（）. ["Light blue haze","Light brown haze","Light gray haze","Perfectly clear"]
水稻返青后分蘖开始发生，直到开始拔节时分蘖停止，一部分分蘖具有一定量的根系，以后能抽穗结实，称为（）；一部分出生较迟的分蘖以后不能抽穗结实或渐渐死亡，这部分分蘖称为（）。
银行营业场所发生突发事件应实行严格的（），违反规定，造成严重后果的要依法惩处相关责任人。 ["报告制度","保密制度","宣传制度","反馈制度"]
启动外围设备的工作由（）来完成。 ["用户程序","操作系统","用户","外围设备自行启动"]
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"]
（）期是指稻穗开花后到谷粒成熟的时期，又可分为（）期、（）期和（）期。
