A.潮汐
B.海水
C.淡水
D.湖水
[单选题]The height of the tide is affected by all of the following EXCEPT______.A. the position of the sunB. channels in the sea bottomC. the direction of the windD. variations in the coast line
[单选题]What can be the best tide for the text?A.A Mother’s LoveB.A Brave ActC.A Deadly RiverD.A Matter of Life and Death
[单选题]The time that high tide occurs at a particular place is affected by all of the following EXCEPT______.A. the direction of the windB. channels in the sea bottomC. variations in the coast lineD. the position of the moon
[单选题]潮汐周日不等(diurnal inequality of tide)的现象为()。A .一天有两次涨潮和两次落潮B .相邻两次高潮或两次低潮潮高不等C .涨落潮时间不相等D .一天有两次高潮或两次低潮的潮高以及相邻的高、低潮的时间间隔不相等
[单选题]每周2次的外文缩写是( )。A.qdB.qidC.bidD.tidE.biw
[问答题] 赤潮和水华①本为自然现象:赤潮(red tide)是海洋中某些微小(2-20微米)的浮游藻类、原生动物或更小的细菌,在满足一定的条件下爆发性繁殖或突然性聚集,引起水体变色的一种自然生态现象。"水华"(water blooms)是一种在淡水中的自然生态现象,只是仅由藻类引起的,如蓝藻(严格意义上应称为蓝细菌)、绿藻、硅藻等。"水华"发生时,水一般呈蓝色或绿色。这两种在自然界就有的赤潮和"水华"现象,在我国古代历史上就有记载。在自然界中它