题干
_____his being late again,he lost his job and had to stay at home.
A：Owe to
B：As a result of
C：In case of
D：Because
答案(点此获取答案解析）
B
A：Owe to
B：As a result of
C：In case of
D：Because
、
是两个不同的平面，
、
是两条不同的直线，给出下列4个命题,其中正确命题是（ ）
，则它的外接球半径R与内切球半径
之比为（ ）
