单项选择题

如图所示,该结构的跨中弯矩为__________。
A、3kN·m,下侧受拉;
B、3kN·m,上侧受拉;
C、4kN·m,下侧受拉;
D、4kN·m,上侧受拉。

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单项选择题

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into active sentence B.
into passive sentence C.
into non-subject sentence D.
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