化合物HCI中H与CI是通过（）键合的。
D
暂无解析
________(fail)severaltimes,theyneedsomeencouragement.
古埃及的"金字塔时代"是指()
Ishallneverforget________(meet)thelatePremierZhouduringhisinspectionofourfactory.
“严复”名词解释
Theterriblenoiseis______memad.
