缓释制剂用药后能在机体内较长时间维持一定的血药浓度，因而减少给药次数，方便用药.
参考答案：对
用45%司盘60（HLB＝4.7）和55%吐温60（HLB＝14.9）组成的混合表面活性剂的HLB值为
A．19.6
B．10.2
C．10.3
D．0.52
E．16.5
The accident produced a very bad impact on the society, so those who _________ the project were severely punished.
A．come up with
B．look out for
C．took charge of
D．took the place of
