这些课不是硬性规定要听的。Attendance at these lectures is not compulsory.参加晚祷并非硬性规定.Attendance at evening prayers is not compulsory.高水材料是一种新型水硬性无机胶凝材料,水灰比高达3.0.The material with high water is a new water - hardening inorganic gelling...
The research revealed that the reaction products were HO + CN, O + HCN, H + CNO, H + NCO, N + HCO and NH + CO.可能的产物是OH+CN 、 O+HCN 、 H+CNO 、 H+NCO 、 N+HCO、NH+CO,这些产物与实验检测到的结果相吻合.Perhaps you do not know. CN domain mail Wha...
They imagined the existence of a physical medium - the ether - filling all of space.他们想象存在一种充满整个空间的物理介质 -- 以太.Today's news goes into the ether and is soon forgotten.今天的新闻广播听后不久即置于脑后了.The null result of the Michelson...