有一单机压缩式制冷理论循环,工作在高温热源为50℃,低温热源为-5℃,制冷剂为R22,进行热计算.

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容量就是功率.单机容量就是单机功率.

金山词霸!

机械能转化为电能

有道词典

第10个不对
应该选 B
so that + 从句
in order to do sth
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你已经初中了,应该会解多元一次方程组设篮球价格是x元/个,排球价格是y元/个按题意找等量关系：排球篮球和排球的单机比为3：2x/y = 3/2单价和为80元x + y = 80因为此方程有特殊性,可不用常规方法解（常规方法可以解）...

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解题思路：知道水深和水的密度，利用液体压强公式求坝底受到的水的压强；
求出4台发电机组的总发电功率，利用W=Pt求一天的发电量．

坝底受到的水的压强：
p=ρgh=1×10³kg/m³×10N/kg×125m=1.25×10⁶Pa；
4台发电机组的总发电功率：
P=7×10⁵kW×4=2.8×10⁶kW，
一天的发电量：
W=Pt=2.8×10⁶kW×24h=6.72×10⁷kW•h．
故答案为：1.25×10⁶；6.72×10⁷．

点评：
本题考点： 液体的压强的计算；电功的计算．

考点点评： 本题考查了液体压强和电功的计算，要灵活选用公式，计算电功时用这一套单位：P-kW、W-kW•h、t-h．

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Discuss in this text a kind of suited for in the small business enterprise,according to single machine version structure model of the customer manage the design and development of the management system of the calculator information.That system adoption ACCESS 2003 Be a customer database management system development tool.Study the foundation which analyzes with need in the possibility up,manage the design project,function mold piece of system and connect a people's design,design and safety of the database system to design to the customer etc.carried on more detailed treatise.

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The safety of single test
1.The debugging personnel in a clear division during the test,a unified command,left the scene without authorization; To test the actual operation of the personnel must have the machine structure,properties and comprehensive knowledge test safety knowledge; Always check the equipment for observation and unusual sound,motor,bearings overheating,ammeter is overrun,in order to handle in time.
2.Equipment test run must have special guard,ready to test records,once take measures to solve the problems in time,prevent it expanded.Must stop check and adjustment,and workers must contact,do not get optional open,parking,prevent accidents.
3.The test run,drive and parking must have signal,forbidden to drive no signal.In case of an emergency also should pass the operator,others may not just press the various kinds of electric switch.
4.Prohibit contacting mechanical equipment of any turning parts,banned in operation equipment the above or below to walk.
5.Need before test are to be part of the cover close (such as the safety equipment cover,screw conveyor lid,edible cover plate,etc ).
6.Do the safety work well ,and commissioning irrelevant personnel should not enter the test or close to test equipment; When conduct site inspection equipment,operation switch should switch to "live" position and hang "it is strictly prohibited to start" warning sign.
7.For the priciple of the test system and test plan,should take it carefully.