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【单选题】
齿长磨损不得超过原齿长的( )%。A.
20
B.
25
C.
30
D.
35
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举一反三
【简答题】A．superior B．inferior C．subordinate D．coordinate
【单选题】The correlation between the sign of internal force of the beam and the coordinate system is that .
A.
the signs of shear force and bending moment are related to the coordinate system
B.
the signs of shear and bending moment are independent of the coordinate system
C.
the sign of shear force is related to the coordinate system, but that of bending moment is independent of the coordinate system
D.
the sign of shear force is independent of the coordinate system, but the sign of bending moment is related to the coordinate system
【简答题】The three coordinate systems are ____________, ____________ and ___________ coordinate system.
【单选题】A line in the standard (x,y) coordinate plane is parallel to the x-axis and 6 coordinate units above it. Which of the following is an equation of this line?
A.
y=6
B.
x=6
C.
y=6x
D.
y=x+6
E.
x=y+6
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