题目内容

Which of the following functions is NOT one of the functions of air conditioner?( )

A. Refreshing the air.
B. Waking up.
C. Adjusting the air humidity.
D. Adjusting the air temperature.

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A wise precaution for an engineer to take is to go through accommodation and public roomsperiodically recording( )

A. dry bulb temperature
B. wet bulb temperature
C. wet and dry bulb temperatures
D. air humidity

切削速度的计算公式()是正确的

A. vc=πdn/1000
B. vc=dn/1000π
C. vc=dn/1000π
D. vc =πn/1|000d

下列选项中不是影响切削变形的因素是()。

A. 工件材料
B. 进给量
C. 刀具前角
D. 切削速度

下列选项中属于数控铣削常用高效率铣削平面的铣刀是()

A. 而侁刀
B. 圆弧铣刀
C. 立铣刀
D. 键槽铣刀