下列标准中()属于国家标准。
A、GB/T700-1988
B、YB/T153-1999
C、Q/SGZGS261-2001
D、ISO9000:2000
参考答案:A
As far as I am concerned, education is about learning and the more you learn, ______. [ ]
A. the more for life are you equipped
B. the more equipped for life you are
C. the more life you are equipped for
D. you are equipped the more for life
醛类因易被氧化为羧酸,而易使酸性高锰酸钾溶液或溴水褪色。向乙醛中滴入酸性KMnO4溶液,可观察到的现象是__________。现已知柠檬醛的结构式为 ,若要检验其中的碳碳双键,其实验方法是_______________。