题型:判断题 Cooking calls for ______ patience and time but it is ______ enjoyable experience.A.a; theB.the; anC./; anD.a; / 查看答案
题型:判断题 肺动脉瓣血流的多谱勒频谱有什么特点()A.舒张期出现,双峰形状,正向B.收缩中期出现,负向,尖峰形状C.收缩期为正向,舒张期为负向,尖峰形状D.收缩期正向,双峰,舒张期负向,波峰园钝E.持续全收缩期,负向,正弦波形状 查看答案