下列哪种静脉麻醉药对心律失常影响最小（）
A.丙泊酚
B.羟丁酸钠
C.硫喷妥钠
D.依托咪酯
E.氯胺酮
参考答案：D
--- Has your brother returned from America yet?
--- Yes, but he ______ here for only three days before his company sent him to Africa.
A．has been
B．was
C．will be
D．would be
关于羌活的描述哪些是错误的
A．药力较强。作用偏下偏表
B．尤善治太阳头痛及下半身风湿痹痛
C．辛温苦燥，升浮发散
D．治疗表证夹湿，风寒湿痹
E．气味浓烈，用量过多，易致呕吐，故脾胃虚弱者不宜服
