On the Western campus, students needn"t pay for their rooms. 在西方校园中，学生不需要支付住宿费用。

上层建筑包括（）上层建筑和观念上层建筑两个方面

未知题型上层建筑包括（）上层建筑和观念上层建筑两个方面

超静定问题要综合静力学、物理、变形三方面来求解。

未知题型超静定问题要综合静力学、物理、变形三方面来求解。

—Did you buy dress yesterdy —No, _____ I liked the colo...

多项选择题—Did you buy dress yesterdy —No, _____ I liked the color, I didn’t like its style.sB．whileC．i—Did you buy dress yesterdy —No, _____ I liked the color, I didn’t like its style.s B．while C．if D．since