在估计可持续增长率时，通常假设内部融资的资金来源主要是( )。A．留存收益 B．净

甲男、乙女系兄妹，为给父亲治病筹钱，经合谋后，由乙女将丙(8周岁)骗往游乐场玩耍，由甲男给丙的父母打电话，声称已经“绑架”了丙，要求丙的父母提供8000元现金放到指定地点。丙的父母了解到甲男和乙女的情况，心生怜悯，于是将8000元放到指定地点。甲男、乙女的行为构成：( )

A．敲诈勒索罪既遂

B．敲诈勒索罪未遂

C．绑架罪既遂

D．绑架罪未遂

The approach we propose is a system-oriented methodology for knowledge acquisition. This orientation emphasizes ongoing documentation throughout each cycle and technique applied. Program-wide documentation is suggested, both for the purpose of internal (71) and for later verification and (72) efforts: The documentation system we propose includes a central "knowledge acquisition (73) "which is (74) to reflect knowledge acquisition plans, session nodes, and domain expert participation. Specifically, (75) within the database system include knowledge acquisition forms, which document plans for, and notes from, knowledge acquisition session, domain expert file, and rule content forms.

（73）处填（）。

A．dataset

B．collection

C．file

D．database

砌块

下列关于设计调查问题的描述正确的是（）

A.只选择那些与所调查资料直接相关的问题

B.把问题按照一定的逻辑顺序排列

C.根据有关的资料和先前的经验检测所设计的问题

D.对少量的被访者做一个先导性的试验访谈

熔炼铸铁常用( )。

A．工频感应炉

B．电弧炉

C．冲天炉

D．平炉

E．坩埚炉