图示为刚架的虚设力系,按此力系及位移计算公式可求出。
A. 同时求出杆A和C的位移
B. 求出杆A点和C点的位移子和
C. 其值必然为零
D. 杆AC的转角
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The girls _to look through the photograph albums.
A. began
B. brgin
C. beginning
D. begined
Spring in East china usually _in about march.
A. sets
B. set
C. seting
D. seted
But if things don't improve,her family will_.
A. break
B. broke
C. broken
D. breaking
A good student usually knows how to sum up knowledge.
A. 对
B. 错