钙拮抗剂对哪种心绞痛疗效最好
A．稳定型心绞痛
B．变异型心绞痛
C．初发型心绞痛
D．恶化型心绞痛
E．自发型心绞痛
参考答案：B
My mother made me my homework first yesterday.[ ]
A. do
B. did
C. to do
D. doing
辨析题：风口和渣口大套均采用铜质材料以提高传热效率。
