倒凹坡度应大于
A.10°B.25°C.5°D.15°E.20°
参考答案:E
按要求改写句子。
1. It's four o'clock. (就画线部分提问)
_______________________________
2. I like swimming. (改为否定句)
3. Does Jack like swimming? (作否定回答)
4. 张琳晚上九点半睡觉. (译成英语)
目前我国的用电负荷分为哪几类?