能有效杀灭炭疽芽胞的方法是()
A.石炭酸
B.漂白粉
C.高锰酸钾
D.甲酚
E.煮沸30分钟
参考答案:B, C, E
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
已知-1<b<0,0<a<1,那么在代数式a-b,a+b,a+b2,a2+b中,对任意满足条件的a,b,对应的代数式的值最大的是( ▲ )
A.a+b
B.a-b
C.a+b2
D.a2+b