强心苷可用于治疗
A．阵发性室上性心动过速
B．心房纤颤
C．心房扑动
D．慢性心功能不全
E．房室传导阻滞
参考答案：A,B,C,D
At least 30 percent of the government speeches abandon ______ tones and embraced the most popular cyber words developed by Chinese netizens in the past year, for example, fuyun (floating cloud, indicating vanity).
A．serious
B．bureaucratic
C．abstract
D．ridiculous
断面图所用断面符号一般应标注在（）。
A.投影方向
B.剖切位置线左侧
C.剖切位置线的右侧
D.无要求
