Which of the following is not a step of beach creation?
A.Water is forced into sand by the high pressure under a crest.
B.Strong whirlpools loosen the sand.
C.The sand is first at the bottom when a crest passes.
D.More sand is pushed back to the sea.
第4题
菜单命令后的英文字符表示()。
A.该命令的英文缩写
B.该命令的键盘操作快捷键
C.与命令无关
D.以上都有不对
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