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【单选题】
以下说法正确的是：A.
热辐射是以介质流动形式传递热量的
B.
太阳黑子有的年份多，有的年份少，其变化周期为11年
C.
维生素B：属于发酵产品
D.
工业酒精含有96％乙醇和1％甲醇，因为甲醇含量低，所以能作为医用酒精使用
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皮皮学刷刷变学霸
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【简答题】As I looked at the faces of my fellow business travelers, I was stunned by the changes I saw in their faces. Many looked visibly frightened now. Even the most sobering passengers looked grim and pale....
【多选题】默认子网掩码是255.255.255.0的是______。
A.
10.16.26.100
B.
172.16.20.10
C.
192.168.1.1
D.
202.31.1.3
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