【简答题】若不同两点P,Q的坐标分别为(a,b),(3-b,3-a),则线段PQ的垂直平分线l的斜率为 ,圆(x-2) 2 +(y-3) 2 =1关于直线对称的圆的方程为 。
【简答题】克服演讲中怯场的技巧有:() A充分准备 B充分自信 C选择熟悉的题目 D熟悉讲稿 E深呼吸
【简答题】克服演讲中怯场的技巧有: A充分准备 B充分自信 C选择熟悉的题目 D熟悉讲稿 E深呼吸等
【单选题】(2013·黑龙江四校高三联考)The church ________ from the 18th century is under repair at present.
【单选题】To ensure the quality of dock repair, C/E should know very well ____.
A.
the repair standard of main docking repair item
B.
the special tool for repair item
D.
the status of docking repair equipment
【单选题】What is true of voyage repair
A.
Voyage repair is a major repair work
B.
Voyage repair is of temporary repair
C.
Voyage repair is carried out in a dock
D.
Voyage repair can lead to voyage schedule breakdown
【简答题】若不同两点 P,Q的坐标分别为(a,b),(3-b,3-a),则线段PQ的垂直平分线的斜率为 .