下列呼吸系统用药，按照药物妊娠毒性分级，属于B类的药物是（）
A.氨茶碱
B.沙丁胺醇
C.沙美特罗
D.乙酰半胱氨酸
E.愈创甘油醚
参考答案：D
—Where is my umbrella? Must I take it with me, Mum ?
—It's fine today. You take it with you. [ ]
A. can't
B. needn't
C. mustn't
资产评估中的市场价值类型所适用的假设前提是（）。
A.移地续用假设
B.公开市场假设
C.清算假设
D.会计主体假设
