A：碳酸钙与醋酸反应 CO32﹣+2H+=CO2↑+H2O
B：硫酸钠和氯化钡溶液反应 Ba2++SO42﹣=BaSO4↓
C：澄清石灰水中通入足量CO2：2OH﹣+CO2=CO32﹣+H2O
D：铁钉放入硫酸铜溶液中 2Fe+3 Cu2+=2 Fe3++3Cu
—Oh, it's me! This photo when I was five years old.
多音字组词
钻zuān____ zuàn____ 教jiào____ jiāo____
下列说法中不正确的是（ ）
My uncle is a farmer. He has ninety 1trees on his farm. My uncle and my2can't pick(采摘) all the apples in fall(秋天).3 they ask my parents and me to 4 them every year. It's Sunday. My parents don't go to5and I don't go to school. So we'll go to the6. We get up early(早) in the 7 My mother is in 8 old clothes. My father buys many kinds of food for my uncle's 9in a shop. She likes them very much. My uncle and aunt 10 us many apples, too. I like to work on the farm.
X、Y、Z、W四种主族元素分属于元素周期表的前三周期，原子序数依次增加，它们原子的最外层电子数之和为15，Y2﹣和Z2+的电子层结构相同．下列说法正确的是（ ）
