管理创新的特征包括()
A.创新费用高
B.创新风险小
C.创新周期短
D.集成性强
参考答案:B, C, D
测KH3(C2O4)2·2H2O(分子量254.2)含量,草醛钙沉淀法;沉淀形成CaC2O4·H2O;称量形成CaO(分子量56.08)样品重 0.517 2g,CaO重0.226 5g,含量应为
A.99.24%
B.99.10%
C.98.35%
D.99.50%
E.99.38%
We all like Tina, so she is very _____ in school. [ ]
A. pretty
B. beautiful
C. funny
D. popular