【单选题】与一个投影面垂直的直线,一定与其它两个投影面平行,这样的直线称之为投影面的( )
【单选题】根据《建设工程工程量清单计价规范》(GB 50500—2008),天棚抹灰工程量计算正确的是( )。
【单选题】根据《建设工程工程量清单计价规范》GB50500,天棚抹灰工程量计算正确的是( )。
【单选题】Which of the following statements is NOT the characteristics of the United States' aircraft launching some satellites?
A.
This method still needs a rocket-powered launch vehicle.
B.
The vehicle can pay no attention to friction with the thick atmosphere.
C.
Much more fuel is needed.
D.
Only smaller satellites can be launched this way.
【单选题】与一个投影面垂直的直线,一定与其他两个投影面平行,这样的直线称为投影面的( )。