Many students asked the teacher _____ the time of the test.[ ]
A. for
B. to
C. about
D. at
C
* * 膜部上方损伤,尿液可渗入到
A.阴囊和腹前壁
B.会阴深隙和耻骨后隙
C.腹前壁和会阴浅隙
D.会阴浅隙和会阴深隙
E.耻骨后隙和骨盆直肠隙
由16个C类网络组成一个超网(supernet),其网络掩码(mask)应为______。
A.255.255.240.16
B.255.255.16.0
C.255.255.255.248.0
D.255.255.240.0