题目

Interested In Childcare? Qualified person or preschool teacher needed for busy childcare center, south of the river. Full-time work guaranteed. Immediate start necessary. The candidate(候选人) must be able to work as a co-operative team member. Phone 6345 2345 for an interview and fax resume to 6345 2345. We Need Office Cleaners! Three people are required for professional cleaning in the CBD area. Working hours from 5: 00 pm on Mondays, Wednesdays & Fridays for each one. Approximately five hours per shift(轮班). A good record is necessary. Experience preferred. Phone 6345 7843 下列离子方程式正确的是（　　）A．铝粉投入到NaOH溶液中：2Al+2 OH-=2AlO2-+H2↑B．钠与硫酸铜溶液反应：Cu2++2Na=2Na++CuC．AlCl3溶液中加入足量的氨水：Al3++3 OH-=Al（OH）3↓D．Ba（OH）2溶液与H2SO4溶液反应：Ba2++2OH-+2H++SO42-=BaSO4↓+2H2O