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【单选题】
第二临界角是()A.
折射纵波等于90°时的横波入射角
B.
折射横波等于90°时的纵波入射角
C.
折射纵波等于90°时的纵波入射角
D.
入射纵波接近90°时的折射角
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文：M: Good afternoon. W: Good afternoon. This is the Hotel Booking Service, isn't it? M: Yes, that's right. Can I help you? W: I'd like a room for three weeks, please. In a good hotel. M: How much d...
A.
Booking a ticket.
B.
Booking a table.
C.
Booking a hotel.
D.
Booking a travel agency.
【单选题】We trust you will do your best to _____ this matter settled at once.
A.
put
B.
have
C.
try
D.
be responsible for
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