单项选择题

In the navigational triangle，the angle at the elevated pole is the ______．
A.meridian angle
B.altitude
C.right ascension
D.azimuth angle

A.A.meridian
B.altitude
C.right
C.azimuth

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第二类永动机是只需从单一热源吸收热便能永远对外做功的动力机械。（）正确错误

单项选择题

Lubricating oil should be changed on a heavy duty diesel engine when ______．A.It gets dark in colorB.A sample rubbed between fingers feels thinC.It has been in use for a specified intervalD.It no longer supports combustion

A.A.It
B.A
C.It
D.It

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