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【单选题】
两列完全相同的平面简谐波相向而行形成驻波。以下哪种说法为驻波所特有的特征A.
有些总是静止不动
B.
驻波的传播伴随着能量的传播
C.
波节两侧的振动位相相同
D.
相邻两个波节之间的振动相位相反
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反馈参考答案：
举一反三
【简答题】,又称调色刀,用富有弹性的薄钢片制成,有尖状、圆状之分,用于在调色板上调匀颜料,不少画家也以刀代笔,直接用刀作画或部分地在画布上形成颜料层面、肌理,增加表现力。
【简答题】——I have watched the .——When ___ you ___ it?A. have; watched B. do; watch C. did; watch D. will; watch
【单选题】--- I have watched the game. When ____you ____it?
A.
have; watched
B.
do; watch
C.
did; watch
D.
will; watch
【单选题】—I have watched the film. —When _____ you _____ it? [ ]
A.
have, watched
B.
do, watch
C.
did, watch
D.
will, watch
【单选题】– Have you watched the popular TV play called You, Come from the Star? The main character Professor Dou in the play is so handsome. -Really? When ______ it?
A.
will you watch
B.
did you watch
C.
have you watched
D.
do you watch
【单选题】---Have you watched the live Oscar Award presentation? ---I ___________it online later because of an important date.
A.
watched
B.
had watched
C.
was watching
D.
have watched
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