已知M=p4(p2q+1),其中p,q为质数,且满足 q-p=29,则M=[ ]
A. 2009
B. 2005
C. 2003
D. 2000
答案:D
He is not () to understand the situation.
A. so quick
B. quick enough
C. enough quick
D. as quick as
质量管理体系文件可分为()、()、()、()。