尿素装置低压冷凝吸收的低压液位槽为何设置低液位报警?
参考答案:
(1)防止液位槽内液位太低而造成甲铵泵抽空,
(2)影响低压甲铵冷凝器冷凝效果,
(3)防止低压窜气。
Eddie eats ______ food, so he is ______ fat. [ ]
A. much too, too much
B. too much, much too
C. much too, too many
D. too much, many too
下列实验过程中,始终无明显现象的是[ ]
A.NO2通入FeSO4溶液中
B.SO2通入已酸化的Ba(NO3)2溶液中
C.NH3通入AlCl3溶液中
D.CO2通入CaCl2溶液中