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【单选题】
This is one of the best films _________ this year.A.
have been shown
B.
that have shown
C.
that have been shown
D.
which has been shown
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【简答题】固体分散体常用的载体材料主要有（）、难溶性载体材料和肠溶性载体材料三类。
【单选题】在室温下,下列物质分别与硝酸银的氨溶液作用能立即产生沉淀的是
A.
CH 3 (CH 2 ) 2 C≡CH
B.
CH 3 C≡CCH 2 CH 3
C.
(CH 3 ) 2 CHC≡CCH 3
D.
CH 2 =C(CH 3 )CH=CH 2
【单选题】The economic profit of a perfectly competitive firm
A.
is less than its total revenue.
B.
equals its total revenue.
C.
is greater than its total revenue.
D.
is less than its total revenue if its supply curve is inelastic and is greater than its total revenue if its supply curve is elastic.
【简答题】固体分散体常用的载体材料有 、 和 。
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