单项选择题

‏图示桁架3杆内力为：‍
‏‍

A．-20kN
B．-6kN
C．-10kN
D．-11kN

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A．a=false;
B．a=1;
C．a=0;
D．a="true";

单项选择题

______ here last night.
A、Something strange was happened
B、Strange something was happened
C、Something strange happened
D、Strange something happened