孕产妇首先发生右心衰竭的疾病是（）。 A.妊娠合并二尖瓣狭窄 B.子痫 C.羊水栓塞

已知：a+b=8，a²+b²=32，则ab=______．

两个圆的周长之比为3：1，那么它们的面积之比是6：1．______．

下列属于第一时期投资银行业务主要特点的是( )。

A．主营业务是证券的承销和分销

B．私人银行大多兼营投资银行业务

C．证券业大多混业经营

D．银行业的强势人物影响巨大

Any dispute arising from duty payment between the auditee and the Customs should be dealt with in accordance with the provision laid down in the

A．regulations on Customs External Auditing of the peopli's Republic of China
B．customs law of the People~ Republic of China
C．regulations on Import and Export Tariff of the People~Republic of China
D．Both B and C