听力原文:W: What exactly do you mean by s friend?
M: Well, it should be someone you know yon can rely on, someone who will help you if you need help, who'll listen to you when you talk about your problems.
Q: What are they talking about?
(19)
A.How to solve problems.
B.Someone who will listen to them.
C.Someone whom they can rely on.
D.What a real friend should be.
第1题
A、200~1000V
B、1000~5000V
C、5000~10000V
D、20000~30000V
第3题
第4题
第5题
A.水和石油渗混在油管内流动
B.洗舱时喷射水花.水柱
C.灭火时喷注蒸汽及二氧化碳
D.以上均有可能
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