在联合降压治疗方案中,三种不同降压机制的药物联合必须包含()
A.无此约束
B.钙拮抗剂
C.β受体阻滞剂
D.利尿剂
E.ACEI
参考答案:D
Teachers have to constantly update their knowledge in order to maintain their professional ________.
(2011·江苏,27)
A.consequence
B.independence
C.competence
D.intelligence
晶体管点火装置初级电流比传统点火装置初级电流大。