不溶于水，可用作缓释制剂的辅料的是（）
A．微晶纤维素
B．碳酸氢钠
C．硬脂酸镁
D．乙基纤维素
E．聚乙二醇
参考答案：D
在开车过程中，循环气自动放空为何要设旁路？
The discovery of how bronze is made was probably accidental, but it
to be an important event.
A．turned over
B．turned about
C．turned out
D．turned off
