图示各结构中,除特殊注明者外,各杆件EI=常数。其中不能直接用力矩分配法计算的结构是 。

A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1484398708147963c6754c87e4bd980d9ceb48321765e.png" alt="上传图片">

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1484398719577dc3476d98023468bbb2e9773ceff7cae.png" alt="上传图片">

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/14843987270703fea67fd9c1f4d719a0f3dfa5329f9eb.png" alt="上传图片">

D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/148439873339482054b006853462eb0e299529c5bf10a.png" alt="上传图片">