稳定型心绞痛的常见诱发因素有()
A.饱食
B.大便用力
C.劳累
D.受寒
E.情绪激动
参考答案:A, C, D, E
_______ is better to love than _______.
A.That; to be loved
B.That; be loved
C.It; be loved
D.It; to be loved
共轭二烯烃也可与卤素、卤化氢等发生亲电加成反应,但比单烯烃更难进行。