吊环受力最大部分是环部，承受拉力比杆部大（）。
A、2～4.5倍
B、3.5～4.5倍
C、2.5～5.5倍
D、2.5～4.5倍
参考答案：D
下列物质属于电解质的是（ ）
A．铜
B．AgNO3
C．蔗糖
D．盐酸
Make sentences. 连词成句。
1. birthday in is your February
2. is birthday when your
3. June is whose birthday in
4. do weekend on you do the what
5. I football play often
6. let watch together us TV
7. eat in evening I dinner at the 7:00
