下列心电图得诊断()
A.室性期前收缩
B.房性期前收缩
C.变界性期前收缩
D.室性心律
E.正常心电图
参考答案:A
丁丁家今年收入比去年增长了一成,表示今年收入相当于去年的______%
Bring the flowers into a warm room _____ they'll soon open. [ ]
A. or
B. and
C. but
D. for