【简答题】如图,平面α⊥平面β,α∩β=直线l,A、C是α内不同的两点,B、D是β内不同的两点,且A、B、C、D 直线l,M、N分别是线段AB、CD的中点,下列判断正确的是( )。 ①当|CD|=2|AB|时,M,N两点不可能重合; ②M,N两点可能重合,但此时直线AC与l不可能相交; ③当AB与CD相交,直线AC平行于l时,直线BD可以与l相交; ④当AB,CD是异面直线时,直线MN可能与l平行;
【单选题】The Pure Drug Company produces insulin, a product with a very stable demand. Even though the price changed several times in the past two years, the demand for Pure Drug's insulin remained relatively u...
【单选题】如图,平面α⊥平面β,α∩β=直线l,A,C是α内不同的两点,B,D是β 内不同的两点,且A,B,C,D 直线l,M,N分别是线段AB,CD的中点,下列判断正确的是 [ ]
A.
当|CD|=2|AB|时,M,N两点不可能重合
B.
当|CD|=2|AB|时,线段AB,CD在平面α上正投影的长度不可能相等
C.
M,N两点可能重合,但此时直线AC与l不可能相交
D.
当AB与CD相交,直线AC平行于l时,直线BD可以与l相交
【单选题】A U.S. import company pays for glassware purchased from a small Japanese producer. Is it part of demand for yen or supply of yen in the foreign exchange market?
【判断题】A company with high demand for its product in a particular foreign market that is associated with high transportation costs would tend to arrange a strategic alliance over any other international orga...
【判断题】Stockouts refer to a situation where a company is out of an item at the same time that there is demand for that item.
【单选题】九寨沟及黄龙水系河床的形成主要得益于()。
【单选题】股东与经营者之间发生冲突的原因可归结为( )。
【判断题】For a company, if the demand and lead time are constant, only cycle stock is necessary.
【单选题】by a greater demand for green products, the food company has set higher standards to ensure the quality.