变化基本上与总体经济活动的转变同步的宏观经济指标是( )。
A.先行性指标
B.同步性指标
C.滞后性指标
D.趋同性指标
参考答案:B
A foreigner's first impression of the U.S. is likely to be ________ everyone is in a hurry ---- often under pressure.
a. what b. that c. which d. one in which
下列哪项不是心悸伴昏厥或抽搐的常见病因()。
A.高度房室传导阻滞
B.阵发性室性心动过速
C.阵发性室上性心动过速
D.心室颤动
E.心房颤动伴三度房室传导阻滞