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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.
【单选题】C6150型车床主轴电动机正转、电磁离合器YC1通电时,主轴的转向为( )。
A.
按钮SB1和SB2
B.
行程开关SQ3和SQ4
C.
按钮SB3和SB4
D.
主令开关SA2