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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.
【判断题】对于中速、中载、中等精度的软齿面齿轮，大小齿轮硬度应相等。
A.
正确
B.
错误
【单选题】减小齿轮泵径向不平衡力的常用方法是( )。
A.
缩小排出口
B.
修正齿形
C.
开泄压槽
D.
缩小吸油口
【单选题】用标准齿条型刀具加工ha*=1、α=20°的渐开线标准直齿轮时，不发生根切的最少齿数为()
A.
l4
B.
l5
C.
l6
D.
17
【单选题】减速箱中小齿轮的轴向定位一般以（）为基准确定。
A.
小齿轮的调整侧隙
B.
大齿轮的轴心线
C.
齿轮的接触面积
D.
齿轮的贴合情况
【单选题】在齿轮减速器中,一般将小齿轮的宽度b1取得比大齿轮的宽度b2( )。(和填空题重复)
A.
大
B.
小
C.
相等
D.
随意取值
【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
【多选题】为减小齿轮轮齿的磨粒磨损而采取的办法是 。
A.
加大润滑油的粘度
B.
提高齿面硬度
C.
把传动设计成闭式传动
D.
采用变位齿轮传动
【判断题】差速壳侧轴承的预紧力只有连同驱动小齿轮的预紧力一起进行测量。()
A.
正确
B.
错误
【单选题】定轴轮系传动比的大小与轮系中惰轮的齿数( )
A.
关
B.
有关，成正比
C.
有关，成反比
D.
有关，不成比例