永久煤柱储量是指在工业储量中,按设计规定并经过正式批准不回收的煤柱储量。
参考答案:对
— How was your stay in Hong Kong?
— And it was a pity that I couldn’t stay there longer.
A.Nothing could be worse.
B.It was just fantastic.
C.A terrible experience.
D.What a hard time I had!
同时可作片剂崩解剂和填充剂的是
A.硬脂酸镁B.聚乙二醇C.淀粉D.羧甲基淀粉钠E.滑石粉