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【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...
A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.
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【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...
A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.
【单选题】齿轮的润滑主要靠（）
A.
边界油膜
B.
刚性油膜
C.
弹性油膜
【判断题】开式齿轮的主要失效形式是点蚀
A.
正确
B.
错误
【单选题】下列性质属“阳”的事物或现象是（）
A.
面色晦暗
B.
声低无力
C.
烦躁不安
D.
精神萎靡
E.
脉象沉弱
【单选题】某齿轮箱中一对45号钢制调质齿轮，经常发生齿面疲劳点蚀破坏，修配更改时，可采取的措施有（）
A.
用40Cr钢调质后替代
B.
适当增大齿轮模数m
C.
适当增大齿数z
【单选题】下列现象与环境污染无关的是 [ ]
A.
赤潮
B.
酸雨
C.
臭氧空洞
D.
火山爆发
【多选题】开式齿轮的主要失效形式是__。
A.
轮齿折断
B.
齿面磨损
C.
齿面胶合
D.
齿面点蚀
【单选题】“视而不见，听而不闻”的现象，表现了______。
A.
注意的指向性
B.
注意的集中性
C.
注意的稳定性
D.
注意的分配性
【多选题】超导现象的特征有
A.
电阻
B.
电阻
C.
全抗磁性
D.
导磁性
【单选题】齿轮的渐开线形状取决于它的（）直径。
A.
齿顶圆
B.
分度圆
C.
基圆
D.
齿根圆
【判断题】自动变速器中的齿轮都是行星齿轮。()
A.
正确
B.
错误
【单选题】水文现象的发生（）
A.
完全是偶然性的
B.
完全是必然性的
C.
完全是随机性的
D.
既有必然性也有随机性