生石灰是石灰石煅烧而成CaO含量()%左右。
A.50
B.80
C.30
D.55
参考答案:B
下列物质敞口放置,因化学变化溶液质量增加的是( )
A.氢氧化钠溶液
B.浓硫酸
C.浓盐酸
D.澄清的石灰水
—Mary wants to see you tonight.
—I’d rather she_________tomorrow.
A.comes
B.came
C.will come
D.should come