下载APP
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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.
相关题目：
【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】圆锥齿轮传动适用于（ ）传动。
A.
相交轴
B.
平行轴
C.
交错轴
D.
任意轴
【单选题】两带轮的传动比i＞1，是()传动
A.
增速
B.
减速
C.
变速
【单选题】3 带的弹性滑动使传动比
A.
不恒定
B.
恒定
C.
平均恒定
【单选题】图示轮系中，已知z1=28，z2=25，z3=70， z3’=30，z4=36，求轮系传动比i14。
A.
8
B.
16
C.
12
D.
3
【判断题】常用的齿轮有三种:圆柱齿轮传动,圆锥齿轮传动和蜗杆蜗轮传动.( )
A.
正确
B.
错误
【单选题】下列不属于齿轮传动的特点的是 。
A.
寿命长，工作平稳，可靠性高
B.
传动动力大、效率高
C.
容易出现打滑
D.
能保证恒定的传动比，能传递任意夹角两轴间的运动
【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】如图,已知:Z1=28,Z2=42,Z3=32,Z4=48,(Z为齿数)其传动比为( )
A.
1
B.
2.5
C.
3
D.
3.25
【单选题】齿轮传动的总等效惯量与传动级数（）。
A.
在一定级数内有关
B.
无关
C.
有关
D.
在一定级数内无关
【判断题】齿轮传动适用于远距离的传动。
A.
正确
B.
错误
【单选题】SS4改电力机车的传动比是（）
A.
88/21
B.
88/22
C.
88/23
D.
88/24
【判断题】齿轮传动功率大。
A.
正确
B.
错误