凭证式国债是一种不可上市流通的储蓄型债券，由具备凭证式国债承销团资格的机构承销。( )
参考答案：对
_____ you may have, you should gather your courage to face the challenge. [ ]
A. However a serious problem
B. What a serious problem
C. However serious a problem
D. What serious a problem
较早认识到与患者接触可感染肺痨的是
A．《内经》B．《中藏经》C．《普济本事方》D．《丹溪心法》E．《仁斋直指方》
