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
