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【单选题】
在种内竞争过程中,参与竞争的个体越多,种内竞争的影响就越大。因此,在生态系统中,种内竞争有利于( )的调节。A.
种类关系
B.
种类名称
C.
种类数量
D.
种类和平
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举一反三
【单选题】下列关于带双泵的四轮驱动系统的工作原理描述中,哪一项是正确的?
A.
两个分别由前、后车轮驱动的泵的输入输出流量差异产生了液压压力,然后,该压力使粘性联轴器的盘接合,从而实现2WD/4WD的选择。
B.
两个分别由前、后车轮驱动的泵的输入输出流量差异产生了液压压力,然后,该压力使湿式多盘离合器接合,从而实现2WD/4WD的选择。
C.
当两个油泵所产生的液压压力超过了预定极限时,湿式多盘离合器接合,实现2WD/4WD的选择。
D.
当两个油泵所产生的液压压力之差超过了预定极限时,该状态会被传感器检测到,然后电磁离合器动作,实现2WD/4WD的选择。
【单选题】What was the effect of Roots?
A.
It had great effect on the black power movement in the US.
B.
People didn't believe the book was about a true story.
C.
It became a bestseller all over the world at once．
D.
The book was a great success and won Haley money and prizes.
【单选题】Which of the following best describes the organization of the first two paragraphs of the passage?
A.
An argument is made, then complicated through the admission of the argument's limitation.
B.
The general nature of a problem is presented, followed a concrete example of the problem.
C.
A thesis is stated, and evidence is provided along with an analysis to support the thesis.
D.
The method of research in a field of science is explained, than illustrated through a specific case.
E.
Two opposing methods of the best means to perform. a science are explained, then shown to reconcilable.
【简答题】It elaborates on what horizontal integration is and its effect on the market.
【简答题】What kind of arrangement effect makes the reader feel upset?
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