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【单选题】
用Φ 12 的刀具进行轮廓的粗、精加工,要求精加工余量为 0.4 ,则粗加工 偏移量为( ) 。A.
12.4
B.
11.6
C.
6.4
D.
6.8
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举一反三
【多选题】应用固体分散技术制备固体分散体应注意
A.
常用的载体材料有水溶性、难溶性和肠溶性载体材料
B.
宜应用于剂量小的药物
C.
液体药物在固体分散体中所占比例不宜超过10%.
D.
一般药物与载体材料的重量比通常在1：5～1：20
E.
固体分散体在储藏过程中会出现老化现象
【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.
【判断题】The economic profit will be less than accounting profit because it takes into account an extra cost.
A.
正确
B.
错误
【简答题】固体分散体常用的载体材料有 、 和 。
【单选题】Suppose firms in a perfectly competitive market are earning an economic profit. As new firms enter, the price ________ and the economic profit of each existing firm ________.
A.
rises; increases
B.
rises; decreases
C.
falls; increases
D.
falls; decreases
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