下列不属于蒸发器稳定操作内容的是（）
A.液面
B.汽压
C.进出料
D.出料密度
参考答案：D
电解水时常在水中加入少量硫酸以增强水的导电性，硫酸本身并不分解．现有25克8%的H2SO4溶液进行电解实验，过一段时间后，测得硫酸溶液中溶质的质量分数为10%，则被电解水的质量是______g．
Sweet memories ______ as I looked at the pictures _____were taken at the beach last summer.
A．took out; which
B． crowded in; which
C．ended up; that
D．dropped by; that
