为了有效地实现调幅，集电极调幅电路必须总是工作于欠压状态。
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实际流体圆管层流的内摩擦力分布是中间最大，管壁边缘为零的线性分布。
A. 正确
B. 错误
Which statement is true about the Cisco Self-Defending Network?（）
A. The Cisco Self-Defending Network defines the physical position of the firewall to protect against internal and external attacks
B. The Cisco Self-Defending Network Provides static filtering against known and unknown internal and external attacks
C. The Cisco Self-defending Network Provides dynamic protection against known and unknown internal and external attacks
D. The Cisco Self-defending Network Provides the Elements to install the antivirus software on the End-User Workstatio
一级电量报警与二级电量报警的设置值分别是（）。
A. 40%、20%
B. 30%、20%
C. 40%、25%
D. 30%、15%
基金管理公司的解散应当按照（）等法律、行政法规的规定办理。
A. 《公司破产法》
B. 《公司法》
C. 《商法》
D. 《保险法》
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