电牵引采煤机传动效率比液压牵引提高50%（）_爱下问搜题

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问题判断题

电牵引采煤机传动效率比液压牵引提高50%（）

答案

参考答案：错

填空题

将2个黑球，3个白球，4个红球放入一个不透明的袋子里，从中摸出8个球，恰好红球、白球、黑球都摸到，这个事件是事件（填“必然”或“不可能”或“随机”）.

补全对话，情景问答

选择合适的句子完成对话。

A. Do you think I can join the walk?
B. Who can take part in the walk?
C. Oh, that sounds great!
D. Have you heard about a fund-raising event ever called Trailwalker?
E. Is it organized by Oxfam Hong Kong?

Kitty:   1
Betty: Yes .  2
Kitty: Yes, it is . I am thinking about joining it . It's a good chance to learn about team spirit .
Betty:  3
Kitty: People over 18 years old . They have to finish the walk within 48 hours .
Betty: It's a tough walk but I'm really interested in it .  4
Kitty: Yes , sure . We can be in the same team .
Bett :  5   Let's find another two members .