【简答题】丙醛在稀碱作用下反应产物经加热生成( )。 A 、 2 —甲基— 2 —戊烯醛 B 、 2 —甲基— 3 —羟基丁醛 C 、 4 —羟基己醛 D 、 3 —己烯醛
【单选题】Sudden disastrous external stress such as in severe automobile accidents, airplane crashes, and underwater explosions may cause death through rupture of the major arteries.
【单选题】Which of the following arrhythmia is at risk of sudden death at any time ( )
A.
atrial premature contraction
B.
ventricular premature contraction
C.
paroxysmal ventricular tachycardia
E.
one - degree atrioventricular block
【判断题】系统回顾是协助病人回顾被遗漏的所患疾病的方法。
【单选题】环烯醚萜类化合物多以苷的形式存在于植物中,其原因是
【判断题】系统回顾是协助病人回顾被遗漏的所患疾病的方法。( )