补全对话, 其中有两个多余选项。
A: Hello! This is Tom speaking. ____
B: Sorry, Jack is out at the moment.
A: ____
B: This is Jack’s mother.
A: Hello! Mrs Brown. ____
B: Of course. ____
A: That’s very kind of you. Would you please tell Jack we will have a party about stamp collection this Sunday morning?
B: Oh, a party about stamp collection on Sunday morning. OK, ____
A. Who's speaking, please?
B. Hold the line, please.
C. Can you take a message for me?
D. Can I take a message for you?
E. I'll tell him as soon as he comes back.
F. Could I speak to Joe, please?
G. Could I speak to Jack, please?
海南历史上投资最大、技术先进、工艺环保的能源建设项目海南昌江核电站,其1号机组于2014年底并网发电.下列关于核能的说法正确的是( )
在一个不透明的口袋里装有只有颜色不同的黑、白两种颜色的球20个,某学习小组做摸球实验,将球搅匀后从中随机摸出一个记下颜色,再把它放回口袋中,不断重复,如表是活动进行中的一组数据统计:
摸球的次数m
100
150
200
500
800
1000
摸到白球的次数n
58
96
116
295
484
601
摸到白球的频率mn
0.58
0.64
0.59
0.605
0.601