VHF天线分别安装于（）
A.机身背部和机身下部（腹部）
B.垂于安定面两侧
C.垂直安定面顶部
D.机身左右大翼尖
参考答案：A
“心灵辩证法”
The ( ) process ascertains which risks have the potential of affecting the project and documenting the risks' characterist.
A．Risk Identification
B．Quantitative Risk Analysis
C．Qualitative Risk Analysis
D．Risk Monitoring and Control
