【简答题】采用离心泵的串并联可改变工作点,对于管路特性曲线较平坦的低阻管路,采用( )组合可获得较高的流量和压头;而对于高阻管路,采用( )组合较好;对于(ΔZ+ΔP/ρ)值高于单台泵所能提供最大压头的特定管路,则采用( )组合方式。
【单选题】According to the last paragraph, which of the following is true?
A.
Media business can benefit from Internet in certain ways.
B.
Some experiments in publishing business used to be cheap.
C.
Albums now make up half of revenues of music industry.
D.
The Internet age promotes the value of the peanuts.
【简答题】对于低阻管路,采用 组合方式可获得较高的流量和压头。
【判断题】对于管路特性曲线较平坦的低阻型管路,采用并联组合方式可获得较串联组合为高的流量和压头;反之,对于管路特性曲线较陡的高阻型管路,则宜采用串联组合方式。
【判断题】( )对于管路特性曲线较平坦的低阻力型管路,采用泵并联组合方式可获得较串联组合方式为高的流量和压头。
【单选题】The degree to which and the ways in which a school encourages participation in games,sports and cultural pursuits are likely to contribute to the shaping of leisure attitudes ______the part of the stu...
【单选题】图中所示为2个4位二进制数相加的串接全加器逻辑电路图,运算后的C3S3S2S1S0结果是 ( )。
【简答题】如题69(a)图所示电路,设Q 0 、Q 1 的初始状态为0。要求: (1)填写状态真值表; (2)在题(b)图中画出Q 1 、Q 0 的波形; (3)说明电路的逻辑功能。