乙醛与斐林试剂作用显示
A. 蓝色沉淀
B. 绿色沉淀
C. 红色沉淀
D. 砖红色沉淀
E. 褪色
鉴别脂肪醛和芳香醛的最好试剂是
A. 托伦试剂
B. 三氯化铁溶液
C. 斐林试剂
D. 碘的氢氧化钠溶液
E. 氢氧化钠溶液
Heart disease is the No.1 cause of death in the world. But, most of the death caused by the heart disease can be prevented.
A. 对
B. 错
Coronary artery disease and microvascular disease can both reduce the blood flow to the heart and cause heart disease.
A. 对
B. 错
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