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
