特高频检测中，干扰信号的抑制可采用关闭干扰源、（）外部干扰、软硬件滤波、避开干扰较大时间、抑制噪声、定位干扰源、比对典型干扰图谱等方法。
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保护组二可有43个主用物理C通道。
A. 正确
B. 错误
Which statement is TRUE，according to the Rules（）.
A vessel not under command shall keep out of the way of a vessel restricted in her ability to maneuver
B. A vessel not under command shall avoid impeding the safe passage of a vessel constrained by her draft
C. A vessel constrained by her draft shall keep out of the way of a vessel engaged in fishing
D. A vessel engaged in fishing while underway shall，so far as possible，keep out of the way of a vessel restricted in her ability to maneuver
在大气压下，天然气的自燃温度约为（）。
A. 480℃
B. 650℃
C. 520℃
D. 550℃
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