【多选题】紫外光谱一般都用样品的溶液测定,溶剂在所测定的紫外区必须透明,以下溶剂哪些能适用于210mm以上
【单选题】Distilled water from an evaporator may be discharged into a potable water tank _____.
A.
through a detachable hose connection
B.
after passing through an activated charcoal filter
C.
after chemical analysis shows it is fit for consumption
D.
through a solenoid operated three-way valve
【判断题】司猗纹的父母对华致远的家世及对他所从事的革命事业比较满意。
【单选题】In a _____ boiler the water flows through the inside of the tubes while the hot gases pass around the outside.
【单选题】Water and air are ().
【单选题】In a ( ) boiler the water flows through the inside of the tubes while the hotgases pass round the outside
【多选题】某化工厂排放的废水流入某湖后,发生大量鱼类死亡事件。在是否承担赔偿责任问题上,该化工厂的哪些抗辩理由即使有证据支持也不能成立?
【单选题】What happens to the waste water?
A.
It is kept in a large storage tank.
B.
It flows away through drains to a sewer.
C.
It flows away through a water main.
D.
It is returned to the waterworks.
【单选题】After the rain soaks into rocks, the rain water flows ______.
B.
down between rock layers