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【单选题】
车床切削直径D=48mm的工件,主切削力F=15.68kN。若主轴转速n=480 r/min,电动机转速为n=2840 r/min,主传动系统的总效率为η=0.75,则电动机的功率为( )KW 。A.
34.8
B.
25.2
C.
40.6
D.
28.2
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举一反三
【单选题】The key factor to reduce society's vulnerability to natural disasters is
A.
insurance companies should be wise enough in their estimates of losses.
B.
the government should bear some financial risks of disaster insurance.
C.
the general public should be made fully aware of the possible damages.
D.
technology should be improved and phases of prediction be considered.
【单选题】听力原文：M: Ms. Roth. This is David Wong from ABC Insurance Company. [22]I'd like to make an appointment to see you about our insurance plans for foreign employees. W: Oh, how did you know my name? M: In ...
A.
An insurance package for foreign companies.
B.
Insurance plans designed for foreign employees.
C.
A position in his company that she may apply for.
D.
Products manufactured by one of his friends.
【简答题】我全家都很健康、快乐。
【简答题】请将1.3名词性从句+状语从句听课笔记电子版录入
【简答题】A．Mr. James Potter works for Sun Electronics. B．Mr. Martin Richard works for ABC company. C．Mr. Martin Richard is wanted on the phone but he is not available. D．Mr. James Potter is wanted on the phone...
【单选题】The key factor to reduce society’s vulnerability to natural disasters is
A.
insurance companies should be wise enough in their estimates of losses.
B.
the government should bear some of the financial risks of disaster insurance.
C.
the general public should be made fully aware of the possible damages.
D.
technology should be improved and three phases of prediction be considered.
【单选题】The purpose of insurance companies to support disaster prediction research is that
A.
companies want to make more money from the insured places.
B.
companies may thus have a better idea of the future risks.
C.
companies can get more sympathies from the government.
D.
companies intend to make use of people's trust in the industry.
【单选题】The purpose of insurance companies to support disaster prediction research is that
A.
companies want to make more money from the insured places.
B.
companies may thus have a better idea of the future risks.
C.
companies can get more sympathy from the government.
D.
companies intend to make use of people's trust in the industry.
【简答题】We ask you to insure our goods ______ US ＄10000 ______ All Risks ______ the ABC Insurance company.
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