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【判断题】
固定画面是指机位和镜头光轴不变，只有镜头焦距可以变化。A.
正确
B.
错误
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举一反三
【单选题】The internal forces of the members of a truss should be ___________.
A.
only axial forces
B.
axial forces and shearing forces
C.
only shearing forces
D.
only bending moments
E.
axial forces and bending moments
F.
axial forces, shearing forces and bending moments
【单选题】For a horizontal beam, there is no horizontal reaction under transverse loads; its internal forces are ____________.
A.
zero
B.
only bending moments
C.
only shearing forces
D.
bending moments and shearing forces
E.
axial forces and shearing forces
F.
bending moments and axial forces
【单选题】Internal forces are not included in an equation of motion analysis because the internal forces are_____
A.
equal to zero.
B.
equal and opposite and do not affect the calculations.
C.
negligibly small.
D.
not important.
【多选题】Internal forces are not shown on a free-body diagram because the internal forces _____.(Multiple choice question)
A.
sum to zero
B.
Are equal and opposite and they do not affect the calculations
C.
Are small
D.
Are not important
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