根据证券分析师的广义定义,下列不是证券分析师的是()。
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How did smoke go out in the ancient castles?
A. Though the window.
B. Through the chimney.
C. Through the door.
D. Through a hole in the roof.
图所示结构受一逆时针向的力偶作用,自重不计,铰支座B的反力RB的作用线应该是()。
A. RB沿水平线
B. RB沿铅直线
C. RB沿B、C连线
D. RB平行于A、C连线