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【单选题】
《供电营业规则》规定,除电网有特殊要求的用户外,用户在当地供电企业规定的电网高峰负荷时的功率因数,100千伏安及以上高压供电的用户功率因数应为()以上。
A.
0.80
B.
0.85
C.
0.90
D.
0.95
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举一反三
【单选题】There is _______'u' and ______'s' in the word 'use'
A.
an; an
B.
a; an
C.
a; a
D.
an; a
【简答题】A.Milk products are not served in McDonald's. B.Mr. Ray Kroc must be a psychol9gical expert. C.McDonald's has a considerable turnover. D.McDonald's can be found in every town.
【简答题】在模数、齿数和压力角相等的情况下,正变位齿轮与标准齿轮相比,下列几何尺寸的变化情况是:齿顶圆直径 ;齿根圆直径 ;分度圆直径 ;基圆直径 ;分度圆齿厚 ;齿根高 。(增大,不变;减小?)
【单选题】There is _____'u' and _____'s' in the word 'use'. [     ]
A.
a, a
B.
an, an
C.
a, an
D.
an, a
【判断题】和标准齿轮相比,正变位齿轮轮齿齿根厚度减小。
A.
正确
B.
错误
【单选题】There is______ “u” and ______ “s” in the word “use”.
A.
a; a
B.
an;a
C.
an; an
D.
a; an
【简答题】阅读理解 In 1995, Ray Kroc visited a small restaurant in California. The owner of it was the Mc Donald (麦当劳) brothers. They built it by the road, so people could drive up to the restaurant, buy food witho...
【单选题】When did Ray Kroc begin to own all the McDonald's?
A.
In 1955.
B.
In 1961.
C.
In 1974.
【多选题】齿数、模数及压力角等基本参数相同的变位齿轮与标准齿轮相比,以下哪些表述是正确的( )
A.
正变位的齿顶高加大,齿根高减小,齿顶圆加大,而齿根圆将减小
B.
分度圆和齿距的尺寸分别相同而保持不变
C.
正变位齿轮的齿厚加大,齿槽宽减小;而负变位齿轮则相反
D.
它们的齿廓都是同一基圆上形成的同一渐开线,只是个所取得段落不同而已
【单选题】There is _______ “u” and _______ “s” in the word “use”.
A.
a; a
B.
a; an
C.
an; an
D.
an;a
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