论述变矩器油温过高的原因？
What statements are true regarding ICMP packets?（） [" They acknowledge receipt of TCP segments."," They guarantee datagram delivery."," They can provide hosts with information about network problems."," They are encapsulated within IP datagrams."," They are encapsulated within UDP datagrams."]
在国防和军队现代化方面，要走中国特色军民融合式发展道路。
亮面（） ["光线直接照射到的地方。","物体上所有亮的部分。","相对于暗的部分。","光线照在物体亮面时所产生的反光。"]
勒沟
色彩的纯度
