主动脉CTA检查时对比剂的常用注射流率是()
A.1.0ml/s
B.1.5ml/s
C.2.0ml/s
D.3.0ml/s
E.6.0ml/s
参考答案:D
—Sorry, Doctor Smith isn't here right now.
—May I ____ a message on his desk?[ ]
A. take
B. send
C. have
D. leave
植物适宜生长的土壤溶液总浓度是()。