单项选择题

波的传播需要荷载物（ ）
A、正确
B、错误

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听力原文：Q: what is the boy going to do?(11)A.To go to the school dining hall with the girl.B.To eat the sandwich his mother has made for him.C.To have lunch with the girl at the restaurant.D.To drink a glass of water only.
A.To
B.
B.To
C.
C.To
D.
D.To
单项选择题
（ ）适用于利用正截面法进行表面展开。
A． 球面
B． 棱锥面
C． 棱柱面
D． 圆锥面
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