室性心律失常的首选药物是
A.奎尼丁B.利多卡因C.胺碘酮D.维拉帕米E.普萘洛尔
参考答案:B
在顺序表(3,6,8,10,12,15,16,18,21,25,30)中,用二分法查找键码值11需要经过 ______ 次比较。
A.2
B.3
C.4
D.5
3. The students will ________ for the Christmas vacation next week.
A.break off
B.break down
C.break through
D.break up