A:2
B:1
C:
D:
The dining hall is __________ to hold 300 people
20℃时将某KNO3溶液129g恒温蒸发水分,第一次蒸发10g水,析出2g晶体;第二次蒸发10g水,又析出3g晶体;第三次蒸发10g水,析出晶体的质量 ()
From the ads above, we learn that _____