荆芥在药典中用高效液相色谱法测定 A.胡薄荷酮 B.消旋薄荷酮 C.橙皮苷 D. 发布时间:2018-01-22 07:15 │ 来源:www.tikuol.com 题型:单项选择题 问题: 荆芥在药典中用高效液相色谱法测定A.胡薄荷酮 B.消旋薄荷酮 C.橙皮苷D.荆芥醇 E.荆芥苷A
题型:单项选择题 用方框中所给单词的适当形式填空,每词限用一次。see yourself light fast wet小题1:I didn’t get ▲ though it rained heavily.小题2:It’s getting darker and darker, please turn on the ▲ .小题3:Last Sunday they went to the zoo and ▲ a lot of animals.小题4:Help ▲ to some cakes, Lily, they’re very delicious. 小题5:He runs very ▲ and he always wins the first place in the race. 查看答案
题型:单项选择题 氢氧燃料电池已用于航天飞机,它是以铂作电极,KOH溶液作电解质,下列叙述不正确的是[ ]A.H2在负极发生氧化反应 B.燃料电池的能量转化率可达100% C.产物为无污染的水,属于环境友好电池 D.供电时的总反应为:2H2+ O2= 2H2O 查看答案