Tom is a true friend, __________ I didn't like him at the __________.[ ]

A. but; beginning

B. or; end

C. and; end

D. and; beginning

制备过程中需调节溶液的pH值3.5～5.0及加入适量氯化钠（）.

A．0.5%盐酸普鲁卡因注射液 

B．10%维生素C注射液 

C．5%葡萄糖注射液 

D．静脉注射用脂防乳 

E．丹参注射液