【简答题】如图,在△MBN中,BM=8,点A、C、D分别在MB、NB、MN上,四边形ABCD为平行四边形,且 ∠NDC=∠MDA,则四边形ABCD的周长是______.
【单选题】There is no conceivable reason why there should be any difficulty during the project. The underlined part can be replaced by all the following EXCEPT______.(2014-78)
【简答题】在平行四边形 ABCD 中,∠ A= , 边 AB 、 AD 的长分别为2、1. 若 M 、 N 分别是边 BC 、 CD 上的点,且满足 ,则 的取值范围是 .
【单选题】Do you have any idea of the reason _____ he referred to?
【简答题】如图,△ABC中, ,D、E分别是AC、AB边的中点,F在BC的延长线上,且 .求证:四边形DECF为平行四边形.
【单选题】The reason why it is so polluted here is ______ people here don't pay any attention to environment protection.
【简答题】How many tips for busniess reception?
【单选题】Listen to some travel tips for Thailand. How many tips are mentioned?
【简答题】在平行四边形ABCD中,∠A= ,边AB、AD的长分别为2、1,若M、N分别是边BC、CD上的点,且满足 = ,则 的取值范围是( )。