I want to buy a pair of gloves ________ my father.
A:to
B:for
C:in
D:at
—Why don't you go out to play, Rose?
—I'm afraid I can't. I have much homework _________.
关于地球大小的叙述,不正确的是( )
如图是某直三棱柱(侧棱与底面垂直)被削去上底后的直观图与三视图中的侧视图、俯视图,在直观图中,M是BD的中点,侧视图是直角梯形,俯视图是等腰直角三角形,有关数据如图所示.
(1)若N是BC的中点,证明:AN∥平面CME;
(2)证明:平面BDE⊥平面BCD.
(3)求三棱锥D﹣BCE的体积.
下列关于抗生素的叙述,正确的是( )