降压启动是最简单.最可靠.最经济运行的启动方式。
参考答案：错
Sandy could do nothing but _________ to his teacher that he was wrong.
A．admit
B．admitted
C．admiting
D．to
属于延长动作电位药物（）
A.奎尼丁
B.美托洛尔
C.利多卡因
D.胺碘酮
E.维拉帕米
