直接作用子血管平滑肌，降低心脏前后负荷的药物是
A．酚妥拉明
B．多巴胺
C．哌唑嗪
D．巯甲丙脯氨酸
E．硝普钠
参考答案：E
Because of the bad weather, my mother ____ and lay in bed. She ______ for a week.
A．has been ill; was ill
B．fell ill; has fallen ill
C．fell ill; has been ill
D．fell ill; is ill
初级飞机类别等级的商用驾驶员执照申请人必须至少有（）小时作为驾驶员的飞行经历时间。
A.150
B.250
C.350
