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【单选题】
有一个晶闸管 - 电动机调速系统,已知电动机参数为: P N =2.8kW , U N = 220V , I N =15.6A , n N =1500r/min ,电枢电阻 R a =1.5 Ω ,整流装置内阻 Rrec=1 Ω, 电枢回路电抗器电阻 R L =0.8 Ω ,触发整流环节的放大倍数 K s =35 。系统开环工作时,当 D=30 , s=10% 时,计算系统允许的稳态速降A.
10r/min
B.
5.56r/min
C.
15.7r/min
D.
26r/min
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【单选题】According to the speaker, which of the following food can make us happy?
A.
Pizza.
B.
Chocolate.
C.
Pie.
D.
Popcorn.
【单选题】Q11
A.
By drinking some green tea and eating some oranges.
B.
By putting some plants near the computer.
C.
By attaching a radiation filter plate in front of screen.
D.
By keeping running every day.
【单选题】Q11
A.
He is interested in Thai artworks.
B.
He is going to open a souvenir shop.
C.
He collects things from different countries.
D.
He wants to know more about Thai culture.
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【单选题】In order to make sure their customers were happy, Pizza Hut introduced______.
A.
two customer satisfaction programs
B.
a 1-600 number customer hotline
C.
a customer call-in program
D.
happy customers program
【简答题】To make a pizza crust Some ( ) ( )
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