题型:问答题 论述题 — What is your plan for the summer holiday, Jim? — I'll go on a trip to Shanghai to see the Expo with my family. — _____.[ ]A. Have a nice time B. Good luck C. Come back soon D. That's all right 查看答案
题型:问答题 论述题 除去下列各物质中的少量杂质,所用方法都正确的个数有( )序号物质杂质除去杂质的方法①CuSO4溶液稀H2SO4加入足量氧化铜粉末充分反应后过滤②NaClMgCl2加入饱和NaCl溶液溶解、过滤、干燥③Cu粉Fe粉用磁铁吸出④Na2CO3粉末NaHCO3粉末加热 A.1个 B.2个 C.3个 D.4个 查看答案