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【简答题】
Task 2 Listen to the text and fill in the blanks with what you hear. “The word ‘etiquette’ means ‘the forms of ___________ prescribed in polite society’. Essentially, etiquette means ‘good _____________.’ When you are in the business world, you should know the ___________________ of business etiquette. The importance of etiquette cannot be overstated because how you present yourself will have a huge _________ on the level of success you will _________. Working as a secretary, you are representing the __________ and ‘face’ of your company; companies tend to ____________ those who can present a positive image to their various stakeholders, as well as the media. Therefore, you should know some fundamental rules of secretary etiquette, which mainly include rules about how to __________ a professional image. To do so, you have to know how to choose adequate dress, _________ appropriate make-up and act in a professional and ___________ manner.”
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【单选题】离心泵启动前灌泵,是为了防止( )现象发生。
A.
气缚
B.
C.
气阻
D.
气泡
【简答题】简述变频调速给水方式原理及优点并绘图
【简答题】简述交流变频调速技术的原理。
【简答题】简述变频器调速原理。
【简答题】离心泵启动前灌泵,是为了防止( )现象发生。A. 4
【单选题】单向稳定变应力时机械零件的疲劳强度计算的一般步骤,下列顺序正确的是( ) 1确定工作应力点M(σm,σa )所对应的零件的极限应力点 M'(σme',σae') 2由外载荷计算σmax 、σmin 3计算安全系数 4将工作应力σm、σa标在零件极限应力图上,得工作应力点: M(σm,σa )
A.
①②③④
B.
②④①③
C.
③①②④
D.
④②③①
【判断题】杆件材料的工作应力上限是极限应力。
A.
正确
B.
错误
【单选题】在法律规范的人身效力上,我国采取
A.
属人主义原则
B.
属地主义原则
C.
保护主义原则
D.
属地主义为基础,属人主义、保护主义为补充的折衷主义原则
【简答题】简述变频调速的工作原理?
【单选题】使材料丧失正常工作能力的应力称为极限应力,低碳钢的极限应力是( )
A.
比例极限σ P
B.
弹性极限σ e
C.
屈服极限σ s
D.
强度极限σ b
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