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【简答题】
Long, long ago, an old woman became blind after a serious illness. She went to see many doctors, but nobody was able to cure her eyes. She was very worried. One day, an eye doctor came to her house. He said he could cure her eyes. The old woman said she wanted to give him much money if he could cure her eyes. "But you will get nothing if you cannot," said the woman. The doctor found she was very rich and there were many good things inn her house. He stole many things from the house. Several days later, the old woman could see with her eyes. The doctor asked for the money. The old woman didn't give him and said angrily, "You haven't cured my eyes. Before I was blind I could see all the things in my room. But now I can see nothing."
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参考答案:
举一反三
【单选题】某热水供暖系统热网水压图如下图所示,设计循环流量G=100t/h,热网供回水管阻力损失均为6mH2O,1mmH2O=9.81Pa,最远用户阻力损失为2mH2O,热源内部阻力损失为12mH2O,设计要求静水压线高度为22mH2O,最高建筑物高度为18m。则设计选用的循环水泵和补水泵扬程分别为( )m。
A.
26.8,24.9
B.
28.0,26.7
C.
25.8,22.1
D.
26.4,24.2
【单选题】图所示文丘里流量计,γ2=2γ1,如果管道中通过的流量保持不变,管道轴线由原来的向下倾斜45°变为水平,U形测压计的读数为( )。
A.
B.
△h
C.
D.
2△h
【简答题】有一小城镇树状管网如下图所示,虚线所示为供水区域界限(即虚线外不供水),各管段的长度和水流方向如图所示,最高用水时的总流量为60L/s,节点流量折算系数统一采用0.5。节点均无集中流量,求管段1-2的计算流量。
【单选题】涡轮流量计性能曲线如下图所示: 涡轮流量计的仪表系数可分为两段,即线性段和非线性段.线性段约为工作段的( ),特其性与传感器结构尺寸及流体粘性有关.在非线性段,特性受轴承摩擦力、流体粘性阻力影响较大.当流量低于传感器流量下限时,仪表系数随着流量迅速变化.
A.
3/4
B.
1/2
C.
1/3
D.
2/3
【单选题】某投资方案各年的净现金流量如下图所示,试计算该方案财务净现值为( ),并判断方案的可行性为( )。(ic=10)
A.
63.72万元,不可行
B.
128.73万元,可行
C.
156.81万元,可行
D.
440.00万元,可行
【单选题】打开一个表应使用的宏操作命令是
A.
OpenTable
B.
OpenQuery
C.
OpenReport
D.
OpenForm
E.
不会
【简答题】The charm of conversation is that it does not really start from anywhere, and no one has any idea where it will go as it meanders or leaps and sparkles or just glows.
【单选题】打开一个表应使用的宏操作命令是
A.
OpenReport
B.
OpenTable
C.
OpenForm
D.
OpenQuery
【判断题】The way of realizing humaneness is to start from behaviour cultivation from home.
A.
正确
B.
错误
【单选题】某截流式合流制截流干管如下图所示,截流倍数为n0=3,3处设溢流井,1-3管段的设计流量为90L/s,旱流流量为10L/s;2-3管段的设计流量为280L/s,旱流流量为20L/s;3-4管段本地污水和雨水忽略不计,截流干管3-4的设计流量和溢流井排出口的流量分别为( )。
A.
80L/s和350L/s
B.
120L/s和250L/s
C.
70L/s和350L/s
D.
100L/s和350L/s
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