单人床一般长2[ ]
A.厘米
B.米
答案:B
—Could you please have a walk with me?
—Sorry, I _______. I have something important to do now.
A.mustn’t
B.needn’t
C.can’t
D.may not
80℃时,120克硝酸钠完全溶于80克水中,恰好饱和,若将此饱和溶液降温至10℃,有多少晶体析出?(10℃时,硝酸钠的溶解度为80克)