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【单选题】
下列关于波的叙述中正确的是（ ）。A.
光的偏振现象表明光是一种纵波
B.
超声波不能在真空中传播
C.
白光经光密三棱镜折射发生色散时，红光的偏折角最大
D.
用透明的标准样板和单色光检查平面的平整度，应用了光的衍射现象
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举一反三
【简答题】John Fisher, a builder, and his wife Elizabeth wanted more living space, so they left their small flat for an old 40-meter-high castle tower. They have spent five years turning it into a beautiful hom...
【单选题】Elizabeth said her husband really wanted to be cured, becauze he was required to speak publicly. What was Lionel's advice?
A.
tp be an indentured servitude
B.
to change jobs
C.
to practice more
D.
to be his patient
【简答题】A. Lend a hand. B. Keep your eyes open. C. Be seen, but not be heard. D. Make friends with your neighbors. E. Volunteer in your community. F. Keep your home safe and attractive. Tips for Being a...
【判断题】when you are scanning a train or bus schedule, it is helpful to use your hand or finger to focus your attention and keep your place.
A.
正确
B.
错误
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