A:There is
B:There was
C:There are
D:There were
设三棱柱ABC﹣A1B1C1的体积为V,P、Q分别是侧棱AA1、CC1上的点,且PA=QC1,则四棱锥B﹣APQC的体积为( )
-6的绝对值等于 ( )