车载VSAT单兵接收图像显示或消隐接收诊断菜单，通过（）键进行切换。
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为减少发射机互调干扰，应（）.
A. 加大发射机之间耦合衰减
B. 减小互调转换损耗
C. 加大发射功率
Foam is a very effective smothering agent and（）.
A. it provides cooling as a secondary effect
B. works well on extinguishing electrical fires
C. can be used to combat combustible metal fires
D. All of the above
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