阻断多巴胺受体而止吐( )
A．胃蛋白酶B．多潘立酮C．硫酸镁D．地芬诺酯E．去氢胆酸
参考答案：B
0和负数没有平方根．______
Are those ______books on the ______desk? [ ]
A. math; teacher
B. math's; teacher's
C. math; teacher's
D. math's; teacher
