奥林匹克数学竞赛主要属于【】
A.诊断性评估
B.形成性评估
C.相对评估
D.绝对评估
参考答案:C
I think leaning English _____ as _____ as learning Chinese. [ ]
A. is; important
B. are; important
C. is; importance
D. are; much important
()系统实现了从风能到机械能的能量转换,()系统则实现了从机械能到电能的能量转换过程。