生物化学家常定义当Q10=2.5时,相应反应的活化能Ea=()kJ·mol-1。
A.71
B.31
C.8.5
D.85
参考答案:A
解析:
由
下面左图为甲、乙、丙、丁四国人口增长状况图,右图为不同阶段人口发展模式图。读图回答1—2题。
1、左图中四个国家人口增长特点与右图人口增长阶段对应正确的是[ ]
A.甲—①
B.乙—②
C.丙—③
D.丁—④
2、影响丙国人口增长模式的主要原因有
①人口受教育程度较低②人们的生育意愿较低③医疗卫生水平较低④经济发展水平较高[ ]
A.①②
B.②③
C.②④
D.③④
We had guests last night who have not stayed in a B&B hotel ago. They did not want breakfast because that they were going out early in the morning. They came back lately and had some tea. I came into the living room and saw one of them just go through the kitchen door but turn on the light. He was looking for a glass the cupboard. He had no ideas that the kitchen was not for guests. I just smiled to me and thought, "What can I do We are guests after all. \
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