主要用于片剂的填充剂的是
A.羧甲基淀粉钠
B.羧甲基纤维素钠
C.淀粉
D.乙基纤维素
E.交联聚维酮
参考答案:C
–What did the old driver say ______ the bus?
–He said his bus ______ an old friend and he missed it.
A.to; liked
B.to; was liked
C.about; was like
D.about; liked
运输的规模经济的特点是运输规模越大则运输费用越低。