选择题：图示桁架中杆件内力等于零，即所谓“零杆”为。ex_1258955740797_0.jpg

题目内容：

图示桁架中杆件内力等于零，即所谓“零杆”为。
ex_1258955740797_0.jpg

(本题3.0分)
A、 BC, AC
B、 BC, AC, AD
C、 BC
D、 AC

参考答案：

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