【单选题】判断两直线相对位置,并选出正确的答案( )。
A.
直线AB与EF平行,直线AB与CD是交叉两直线,直线CD与EF是交叉两直线。
B.
直线AB与EF平行,直线AB与CD相交,直线CD与EF相交。
C.
直线AB与EF是交叉两直线,直线AB与CD相交,直线CD与EF是交叉两直线。
D.
直线AB与EF平行,直线AB与CD相交,直线CD与EF是交叉两直线。
【单选题】I’m sorry to say you didn’t pass the exam-- ______, you won’t receive the diploma.
【简答题】Miss Wang works in a large travel agency in Beijing. English is her foreign language. Now she is talking about her job. I was born and brought up in Beijing and I’m very happy to work here. I like thi...
【简答题】某井钻至井深2952.45m后决定起钻,其井下钻具总长为2943.35m,起钻时发现10根坏钻杆,其总长为93.68m,下钻时将坏钻杆换下,而在坏钻杆的位置替入同规格的好钻杆10根,总长是92.52m,求下钻到底时的方入?
【单选题】急性肾小球肾炎病人,出现少尿的主要原因是
【简答题】光敏色素中具有生理活性的______的量与总光敏色素量Ptot的比值即______。