图示结构当水平支杆产生单位位移时，B-B截面的弯矩值为()。
A. EI/l2
B. 2EI/l2
C. 3EI/l2
D. 不定值
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图示结构(E为常数)，杆端弯矩(顺时针为正)正确的一组为()。
A. MAB=MAD=M/4，MAC=M/2
B. MAB=MAC=MAD=M/3
C. MAB=MAD=0.4M，MAC=0.2M
D. MAB=MAD=M/3，MAC=2M/3
What are the two major obstacles for the negotiation team according to paragraph three？
A. a unified negotiation strategy and conflicts of interests among members
B. bad emotion and ineffective communication among team members
C. mutual distrust and ill preparation
D. ineffective planning and lack tactics
A．AlthoughB．SinceC．Even thoughD．If
Although
B. Since
C. Even though
D. If
A．happyB．rigidC．cohesiveD．active
A. happy
B. rigid
C. cohesive
D. active
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