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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.
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.
【判断题】退火可消除工件的内应力。
A.
正确
B.
错误
【判断题】正火与退火的最大区别在于正火的冷却速度快。
A.
正确
B.
错误
【单选题】()最适宜采用退火。
A.
高碳钢
B.
低碳钢
C.
为了降低成本
D.
力学性能要求较低的零件
【单选题】离心铸造的铸件是在()的作用下结晶的。
A.
离心力和压力
B.
压力和重力
C.
离心力
D.
离心力和重力
【单选题】下列哪项不是铸造支架的优点
A.
无异味
B.
异物感小
C.
设计不灵活
D.
导热好
E.
坚固
【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】低温退火是（）。
A.
有相变退火
B.
无相变退火
C.
完全退火
D.
不完全退火
【单选题】下列哪项不是铸造支架的优点（）
A.
坚固
B.
异物感小
C.
设计不灵活
D.
无异味
E.
导热好