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【单选题】
在利用剪力、弯矩和载荷集度之间微分关系作图时,下列说法正确的是()。A.
如果作用有的均布载荷，则该段的弯矩图上凸，且弯矩必为正值
B.
如果作用有的均布载荷，则该段的剪力必为负值
C.
如果段剪力为零，则该段内弯矩为水平线
D.
如果既有均布载荷又有集中力，则剪力图和弯矩图都发生跳跃
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举一反三
【单选题】Which famous Greek tragedy does the picture describe?
A.
“Prometheus Bound”
B.
“Medea”
C.
“Oedipus Rex”
D.
“The Trojan War”
【单选题】Why does the professor say this?
A.
Because the central area was very famous during that period.
B.
Because the central area was the largest area at that time.
C.
Because thousands of people came in from the countryside.
D.
Because many large ceremonial centers were there also as market places.
【单选题】Which ethnic group does the famous song Chile Chuan describe?
A.
The Tibetan
B.
The Miao
C.
The Mongolian
D.
The Uighurs
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