题目

某同学在探究匀变速直线运动规律的实验中: (1) 打点计时器是一种使用(选填“交流”或“直流”)电源的计时仪器 (2) 使用打点计时器时,接通电源与让纸带随小车开始运动这两个操作过程的操作顺序应该是 A . 先接通电源,后释放纸带 B . 先释放纸带,后接通电源 C . 释放纸带的同时接通电源 D . 哪个先,哪个后都可以 (3) 某次纸带记录情况如图所示,如果从某点A起,每打5个点取一个计数点(时间间隔0.1s),并标明A 选择方框中的句子完成对话,其中有两项多余。(2.5分)A: Hi , Tony .___小题1:___ .B: Yes , of course .A: ___小题2:___ .B: Yes , and I swim very well .A: That’s good .  ___小题3:___.B: This weekend ? I’m sorry I have to visit my grandparents with my parents then .A: It’s a pity . __小题4:__ .B: By the way , are you free next Saturday ?A: Oh , yes .B: ___小题5:____A: Yes , I’d love to .When will it start ?B: At seven in the evening .A; I think I’ll be there on time .Maybe another time .Who taught you to swim .Can I ask you a question ?Do you like swimming ?Can you go swimming with me this weekend ?How about you ?And would you like to come to my birthday party ? 
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