方程2x+1=3和方程2x-a=0的解相同,则a=______.
由2x+1=3得:2x=2,
解得x=1,
把x=1代入方程2x-a=0得:2-a=0,
∴a=2.
用所给词的适当形式填空。
1. - Can you hear someone ________ (cry) in the next room?
- No, I can't.
2. Listen! Someone ________ (shout) in the next room.
3. I should look after ________ (me). I've grown up.
4. Jim said he ________ (do) his homework at that time.
5. Our teacher told her ________ (not be) late for school next time.
关于塔式生物滤池在构造和净化功能方面主要特征描述不正确的是()
A.水力负荷大
B.可处理有毒物质
C.只单级进水
D.通风良好,有冷却效果