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【简答题】
一台三相八极异步电动机的数据为: 额定容量PN = 50kW, 额定电压UN = 380V, 额定频率fN = 50Hz, 额定负载时的转差率为0 .025 , 过载倍数λ= 2。 (1 ) 用转矩的实用公式求最大转矩对应的转差率; (2 ) 求转子的转速。
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举一反三
【多选题】Complete the sentences with the words below. Ann works as a 1 ___________ to the manager in a computer company. As a 2 __________, Mr. Smith has interviewed more than 50 famous people. Xiao Young, ...
A.
salesman ;
B.
secretary;
C.
accountant ;
D.
clerk ;
E.
journalist ;
F.
teacher
【单选题】夏季,5周龄散养鸡群食欲不振,腹泻,粪便带血,剖检见小肠中段肠管高度肿胀,肠腔内有大量血凝块,刮取肠粘膜镜检见多量裂殖体该病可能是(2017 真题上198)
A.
弓形虫病
B.
隐孢子虫病
C.
球虫病
D.
住白细胞虫病
E.
组织滴虫病
【单选题】夏季,5周龄散养鸡群食欲不振,腹泻,粪便带血,剖检见小肠中段肠管高度肿胀,肠腔内有大量血凝块,刮取肠粘膜镜检见多量裂殖体引起鸡群感染的是(2017 真题上199)
A.
裂殖体
B.
裂殖子
C.
配子体
D.
刚排出的卵囊
E.
孢子化卵囊
【多选题】Complete the sentences with the words given below, changing the form if necessary. 1. Put a computer ________ under the desk, which will save some space on the desk. 2. As a ________ , you must be goo...
A.
case
B.
microprocessor
C.
salesman
D.
journalist
E.
circuit
F.
operating system
【简答题】Try to match the following columns. A: B: 1. a closed circuit a.minus 2. as a matter of fact b.cell 3. an open circuit c.be composed of 4. negative d.a circui...
【多选题】英语B级练习8 1. We regard customer complaints as an opportunity to our service. A. bring B. receive C. improve D. obtain 2. We took advantage of its sports facilities staying at the hotel. A. although ...
A.
C
B.
B
C.
D
D.
A
E.
D
F.
C
G.
B
H.
A
I.
C
J.
D
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