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【多选题】
挡土墙排水方式有哪些（）。A.
墙后土坡排水、截水明沟、地下排水网
B.
地面封闭处理
C.
墙面设泄水
D.
墙后暗沟排水
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反馈参考答案：
举一反三
【多选题】如图所示 , 两个频率与相位、振幅均相同的波的干涉图样中,实线表示波峰,虚线表示波谷,对叠加的结果正确的描述是 ( )
A.
在 A 点出现波峰后，经过半个周期该点还是波峰
B.
B 点在干涉过程中振幅始终为零
C.
AD 连线上的点都是振动加强点
D.
当 C 点为波谷时，经过一个周期此点出现波峰
【单选题】The rhetorical function of the first paragraph is to
A.
serve as prelude to the author’S argument．
B.
present the author’S counterargument．
C.
introduce Rona Jaffe’S novel．
D.
bring into focus contrasting opinions．
【单选题】Which of the following is correct?
A.
The prelude is more unnerving than the rest of the film.
B.
The prelude is as unnerving as the rest of film.
C.
The prelude is less unnerving than the rest of the film.
D.
The prelude is as unnerving as most of the remaining part of the film.
【单选题】We are glad to send you this introductory letter, hoping that it will be the prelude () mutually beneficial relations between us.
A.
for
B.
to
C.
on
D.
in
【简答题】Writing The Prelude is a process of ____.
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