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The distance between the surface of the water and the tidal datum is the______．A.height of tideB.charted depthC.actual water depthD.range of tide

题目

The distance between the surface of the water and the tidal datum is the______．

A.height of tide

B.charted depth

C.actual water depth

D.range of tide

相似考题

1.Application of the transformational rules yields__________ structure. A．lexicon B．deep C．mexical D．surface

2.Surface可以表示参数方程曲面

3.Surface可以表示旋转曲面

4.共用题干 第三篇“Life Form Found" on Saturn ' s TitanScientists say they have discovered hints of alien life on the Saturn'5 moon.The discovery of a sort of life was announced after researchers at the US space agency,NASA,analyzed data from spacecraft Cassini, which pointed to the existence of methane-based form of life on Saturn's biggest moon.Scientists have reportedly discovered clues showing primitive alien beings are"breathing"in Titan's dense atmosphere filled with hydrogen.They argue that hydrogen gets absorbed before hitting Titan's planet-like surface covered with methane lakes and rivers.This,they say,points to the existence of some"bugs"consuming the hydrogen at the surface of the moon less than half the size of the Earth."We suggested hydrogen consumption because it's the obvious gas for life to consume on Titan,similar to the way we consume oxygen on Earth,"says NASA scientist Chris McKay."If these signs do turn out to be a sign of life,it would be doubly exciting because it would represent a second form of life independent from water-based life on Earth."To date,scientists have not yet detected this form of life anywhere,though there are liquid-water-based microorganisms on Earth that grow well on methane or produce it as a waste product. On Titan,wheretemperatures are around minus 17 Kelvin(minus 290 degrees Farenheit),a methane-based organism would have to use a substance that is liquid as its medium for living processes,but not water itself. Water is frozen solid on Titan'5 surface and much too cold to support life as we know it.Scientists had expected the Sun'5 interactions with chemicals in the atmosphere to produce a coating of acetylene on Titan'5 surface.But Cassini detected no acetylene on the surface.The absence of detectable acetylene on the Titan's surface can very well have a non-biological explana-tion,said Mark Allen,a principal investigator of the NASA Titan team."Scientific conservatism suggests that a biological explanation should be the last choice after all non- biological explanations are addressed,"Allen said."We have a lot of work to do to rule out possible non-bio- logical explanations.It is more likely that a chemical process,without biology,can explain these results."What do scientists claim to have found about Saturn?A: Water-based life on it.B: Methane-based life on its biggest moon.C:A new moon moving around it.D:Earthlike life on its biggest moon.

参考答案和解析
正确答案：A
海平面和潮汐基准面的差距是潮高。
更多“The distance between the surface of the water and the tidal datum is the______.A.height of ”相关问题

  • 第1题：

    【单选题】data

    A．n.主修科目

    B．n.指令

    C．n.模型

    D．n.资料; datum的复数; 数据


    B

  • 第2题：

    Distance（)表示距离


    B

  • 第3题：

    是Surface的抽象接口，操纵surface的控制器。


    lockCanvas

  • 第4题：

    25、Surface可以表示旋转曲面


    正确

  • 第5题：

    23、Distance（)表示距离


    B

  • 第6题：

    15、实平面上任意一点到原点的距离函数可以定义为 distance :: Float -> Float -> Float distance x y = ... distance x y 表示坐标点（x,y)到原点（0, 0)的距离。请判断下面哪些表达式是类型错误的。

    A．distance (1,2)

    B．distance (1+2)

    C．distance (1+2) 5

    D．distance (1+2) (2+3)


    (1)设曲线L上过点P(xy)的切线方程为Y—y＝y'(X－x)令X＝0得该切线在y轴上的截距为y－xy'．由题设有 此为一阶齐次微分方程令 将此方程转化为 两边积分并代入 。由于L经过点 于是L的方程为 。(2)设第一象限内曲线 在点P(xy)处的切线方程为 它与x轴及y轴的交点分别为 。于是所求面积为 令 S'(x)＝0得 容易验证 是函数S(x)在 内的极小值点且是唯一的极小值点即为最小值点．于是所求切线为 。 [分析](1)先求出切线方程及其在y轴上的截距，由题设可得到与待求曲线对应的函数所满足的微分方程．(2)由面积最小，可得曲线上的切点，从而求出对应的切线方程．[评注]本题是一道综合题，主要考查由实际问题建立微分方程的能力、微分方程的求解、导数与定积分的几何应用以及求函数的极值．求曲线在任意点P(x，y)处的切线方程时，由于任意点已用x和y表示，因此切线上任意点的坐标设为(X，Y)，以示区别．这是求解这类问题的一种习惯做法，应引起注意．

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