圣垂电缆头主要由什么组成?
参考答案:
圣垂电缆头由:壳体、绝缘块、密封垫、护盖、端子、小扁电缆等组成。
A professor of economic and history at Atlanta University, W.E.B.Du Bois, promoted full racial equality.()
A. economy
B. economics
C. economical
D. economic
使用干粉灭火器应特别注意堵管现象。