视频高斯波形的产生采用（）方法形成高斯脉冲。
A. 折线逼近
B. EPROM读出数据，D/A变换
C. RON读出数据，D/A变换
D. 一次成型
“根深叶茂”“本固枝荣”等反映根和茎叶的协调关系。
A. 正确
B. 错误
债务锁定（项目整体成本）应在项目竣工后（）内完成。
A. 7天
B. 15天
C. 30天
D. 45天
What does the DSC control unit do if the GMDSS radio operator fails to insert updated information when initiating a DSC distress alert（）.
A. It will abort the transmission and set off an audible alarm that must be manually reset
B. It will initiate the DSC distress alert but，as no information will be transmitted，rescue personnel will not be able to identify the vessel，its position or its situation
C. It will initiate the DSC distress alert and default information will automatically be transmitted
D. It will initiate the DSC distress alert，but any station receiving it will have to establish contact with the distressed vessel to determine its identity，position and situatio
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