A:Ba(OH)2溶液与Na2SO4溶液:pH=13
B:醋酸与CH3COONa溶液:c(Na+)+c(H+)=c(CH3COO一)+c(OH一)
C:Na2CO3溶液与NaOH溶液:c(Na+)>c( CO32-)>c(OH一)>c(H+)
D:Na2CO3溶液与NaHCO3溶液:2c(Na+)=3c(CO32-)+3c(HCO3-)+3c(H2CO3)
实验室购买了一批规格为“2.5V 0.75W”的小灯泡,小明利用其中一只灯泡做测量小灯泡电功率的实验.
good,bad,meat,remember,healthy
What's____ food and drink for children?A lot of ice cream.hamburgers and cola and too much____ and sugar.They are____ for children.
What's healthy food and drink for children?Carrots,eggs,sweet potatoes,milk,cheese,fish and chicken soup are____ for children.
So____ to eat well and stay healthy.
Hundreds of students came to Shaoxing to work ________ the World Choir Games in 2010.
孔子曾问“礼”于老子,儒家学说也一度与道墨法诸家并行争鸣,儒家学说成为封建正统思想始于( )
下列各句中,没有语病的一句是答( )