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问题 单项选择题

阐述下列制备缓释制剂的原理

青霉素与普鲁卡因成盐

A．制成溶解度小的盐
B．增加黏度以减小扩散速度
C．制成不溶性骨架
D．离子交换作用
E．溶蚀和扩散相结合

答案

参考答案：A

选择题

I found that the homework was ______ I used to get in my old school.

A．not heavy as what

B．as not heavy as that

C．not as heavy as that

D．not as heavy as what
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远期外汇交易
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