My parents are strict _________ their work and they are also very strict ________ me.
A:with; in
B:with; with
C:in; with
D:in; in
中国人口问题的主要矛盾是( )
(Ⅰ)求证:EF∥面ABC;
(Ⅱ)求证:平面ADE⊥平面ACD;
(Ⅲ)求四棱锥A﹣BCDE的体积.
如图是一个正方体骰子的表面展开图,请根据要求回答问题:
(1)如果1点在上面,3点在左面,几点在前面?
(2)如果5点在下面,几点在上面?