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问题 单项选择题

以高速前飞时，后行桨叶失速最容易在什么情况下出现（）.

A.总重不大，高度高和平稳气流

B.总重很大，高度低和平稳气流

C.总重很大，高度低和颠簸气流

答案

参考答案：C

单项选择题

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
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单项选择题

下列虚基类的声明中正确的是

A．class virtual B：public A

B．virtual class B：public A

C．class B：public A virtual

D．class B：virtual public A
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