买方以信贷形式从卖方购进机器设备进行生产并以所生产的商品或其他劳务支付贷款的贸易方式是()
A.加工贸易
B.补偿贸易
C.易货贸易
D.租赁贸易
参考答案:B
—I can’t get on well with some of my classmates. They just leave me in the cold.
—________ But what’s the reason?
A.Sorry to hear that.
B.How about that?
C.Don’t mention it.
D.Never give up!
青霉素类的基本母核是:
A.7-氨基头孢烷酸
B.6-氨基青霉烷酸
C.β-内酰胺环
D.氨基苷结构
E.大环内酯结构