TCAS天线的特点是()
A、天线有方向性,且4个导线接头不能接错,天线馈线长度误差不能大于5英寸
B、4个导线有方向性
C、天线为无方向性天线,但馈线有方向性
参考答案:A
根据句意和汉语注释,写出单词的正确形式
1. Gao Xiaosong was (惩罚) because he drove his car after he drank on May 9th.
2. Tom broke the (记录)for the one-hundred meter race at the school sports meeting.
3. It's a good idea to start a part-time job if it doesn't _____________your studies.(影响)
4. Drinks are _____________(可获得的) in any supermarket.
锅炉蒸汽包、圆形容器等,由于(),所以采用链、索拉紧能使夹紧力沿圆弧薄壁均匀分布。
A.工件壁薄
B.呈圆形结构
C.由焊接组合而成
D.受力点不集中
E.直径很大
F.长度很大