97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

<ruby id="6wu0z"><output id="6wu0z"></output></ruby>

<ruby id="6wu0z"><xmp id="6wu0z"></xmp></ruby>

單項(xiàng)選擇題

In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream，and is called a（）.

A.seiche
B.bore
C.boundary wave
D.surge

你可能感興趣的試題

單項(xiàng)選擇題

In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n)（）.

A.apogean tide
B.double high water
C.perigean tide
D.bore

單項(xiàng)選擇題

In shallow water，waves that are too steep to be stable，causing the crests to move forward faster than the rest of the wave，are called（）.

A.rollers
B.breakers
C.white caps
D.surfers

<dl id="zyjhj"></dl>