多项选择题

脂质体的制备方法有( )

A.注入法
B.薄膜分散法
C.超声波分散法
D.逆相蒸发法
E.冷冻干燥法

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单项选择题

If a profit-maximizing, competitive firm is producing a quantity at which marginal cost is between average variable cost and average total cost, it will

A． a. keep producing in the short run but exit the market in the long run.
B． b. shut down in the short run but return to production in the long run.
C． c. shut down in the short run and exit the market in the long run.
D． d. keep producing both in the short run and in the long run.

单项选择题

聚氨酯合成反应中,若异氰酸酯基团和羟基两者物质的量的比值 R=2,则:()(单选) A、分子扩链, 端基为—OH B、分子无限扩链, 端基为—NCO 及—OH C、分子不扩链, 端基为—NCO D、分子不扩链, 端基为—NCO, 且存留有未反应的异氰酸酯

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