[多选] 通过下列（）方法可以得到大肠杆菌组氨酸缺陷型的回复突变菌株。

With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by （）. a brine pump。 an air ejector。 a feed pump。 distillate pum。 以下（）接口是数码摄像机上标准的数码输入/输出接口。 USB。 S-Video。 DV In/Out。 AV。 A vessel is equipped with cross-connected deep tanks. In which situation should the cross-connection valve be closed? （） The tanks lie above the waterline and are filled。 The tanks are partially filled with dry cargo。 The tanks are partially filled with liquid cargo。 The tanks are filled and lie below the waterline。 A sling psychrometer is a(n)（）. type of cargo gear。 instrument used in celestial navigation。 instrument used to measure relative humidity。 instrument used to measure specific gravity。 低压管网成环时，边长一般控制在（）。 300～600m。 200～500m。 100～400m。 通过下列（）方法可以得到大肠杆菌组氨酸缺陷型的回复突变菌株。