接触网带电部分至固定接地物的距离,不得小于()。
A、2000mm
B、1000mm
C、500mm
D、300mm
参考答案:D
根据句意及首字母提示在横线处填上恰当的单词,使句子意思完整,语法正确。
1. There is a long water s_____ in the Water World.
2. The vegetables at the m______are cheaper than those at the supermarket.
3. I kept waiting for my girlfriend for two hours but she didn't______up.
4. All the s______in the restaurant are very kind and helpful.
5. The boy jumped up and down like a c______. Everyone laughed.
游戏活动具有社会性、()、兴趣性和愉悦性、()和具体性的特点。