已知某泵的扬程为100m,输送介质的比重为700kg/m,出口流量为36m/h,其

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问题:

已知某泵的扬程为100m,输送介质的比重为700kg/m,出口流量为36m/h,其轴功率为14.4kw,求该泵的效率为多少?

考点:常减压装置考试常减压装置考试题库
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一般来讲,持有成本的时间长短与基差大小成正比。()

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Last weekend  I was out walking with my dog. She loves wandering around and seeing          we meet, so it becomes a social walk rather than an exercise.
Then we     0ur neighbour who was preparing to sell her house.  She was busy getting ready for her open house(看房时间)that afternoon . After talking a little we went our separate ways .I could tell it was a(n)      day for her.
After I got home, I quickly      some of the wonderful  lavender(薰衣草) in my garden
Wonderful! They smelled good and  the purple            were so pretty. I wrapped some packing paper around the bunch and          it to my neighbor for her open house. I loved her expression          she saw me there with a bunch of lavender!  It            made me happy. It made her stop and take a deep      and maybe reduced her stress for a second
The next day I had a note in my mailbox from my neighbor thanking me for my        . She said everybody commented on how wonderful her house smelled She said the       0f kindness I showed helped          some of the stress she was feeling. Her note was like a big hug to me.
Never        that it's the gift from the heart that is the most       .I think sometimes we hesitate(犹豫) to do the        acts of kindness because we may think  they aren't anything but actually they are probably the  best gift
小题1:
A.dogsB.peopleC.scenesD.food
小题2:
A.came acrossB.came upC. came toD. came into
小题3:
A. excitingB.naturalC. activeD. difficult
小题4:
A.boughtB.cutC.raisedD.buried
小题5:
A.leavesB.grassC.flowersD.roots
小题6:
A.tookB.postedC.placedD.moved
小题7:
A.becauseB.whenC.untilD.if
小题8:
A.hardlyB.probablyC.merelyD.completely
小题9:
A.breath .B.sighC.lookD.step
小题10:
A.ideaB.kindnessC.activityD.matter
小题11:
A.formB.desireC.actD.service
小题12:
A.LoseB.realizeC.warnD.remove
小题13:
A.forgetB.considerC.changeD.mention
小题14:
A.honestB.friendlyC.valuableD.expensive
小题15:
A.totalB.trueC.easyD.simple
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—Didn't you finish your homework last night?

—_______, though I wasn't feeling well.[ ]

A. No, I hadn't

B. Yes, I had

C. No, I didn't

D. Yes, I did

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典型婴儿痉挛症表现为()

A.智力低下

B.早期用皮质类固醇疗效较好

C.肌阵挛性发作

D.1岁前发病

E.EEG高波节律紊乱

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社区管理主体的管理功能具体包括三方面内容( )。
①处理社区关系;②满足社区各种需求;③提供社区服务;④维护社区利益;

A.①②③
B.②③④
C.①③④
D.①②④

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