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【单选题】
把一根十分长的绳子拉成水平,用手握其一端.维持拉力恒定,使绳端在垂直于绳子的方向上作振动,则A.
振动频率越高，波长越长
B.
振动频率越低，波长越长
C.
振动频率越高，波速越大
D.
振动频率越低，波速越大
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反馈参考答案：
举一反三
【单选题】如何让导入的视频拖入时间帧后,播放就从视频首开始播放?
A.
必须放置在时间轴上
B.
必须把导入的视频放置在v轨道的左边最顶端
C.
必须按住shift放置
D.
必须放置在a轨横向右边顶端
【单选题】“I _________ his telephone number.” “I have his number, but I _________ to bring my phone book.”
A.
forget, forget
B.
forgot, forgot
C.
forget, forgot
D.
forgot, forget
【单选题】— Haven't I told you that the computer needs _____? — Sorry, I forgot _____ it fixed. I'll send it for repair right away. [ ]
A.
to be repaired; having
B.
to repair; to have
C.
repairing; having
D.
repairing; to have
【多选题】以下关于“物质”的论点，正确的有( )。
A.
物质就是粒子
B.
物质就是原子
C.
物质的根本特性是运动
D.
“物质”概念反映形形色色的具体实物的共性
E.
“物质”概念是对一切可感事物的共同本质的科学抽象
【单选题】—Tony, I really appreciate your wonderful performance in the concert． —_________．
A.
I've practiced for ages
B.
Well, it's just so-so
C.
No, I don't think so
D.
Thank you very much
【简答题】物质的根本特性是
【单选题】I became conscious of the ______between play and sport when I helped organize a sandlot football team at the age of 12.
A.
difference
B.
reference
C.
interference
D.
conference
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