移动式石油钻井平台不包括（）。
A.自升式钻井平台
B.钻采两用平台
C.坐底式钻井平台
D.浮式钻井船
参考答案：B
零基预算法和基期预算法的优缺点是？
He's never been to English, ___? [ ]
A. isn't he
B. has he
C. is he
