钢结构中管、球加工中，半球圆形坯料钢板应用（）或等离子切割下料。
A.乙炔
B.氧乙炔
C.甲醛
D.丙炔
参考答案：B
—I think math is more useful than
—I don't _________ you. They are both useful. [ ]
A. get on with
B. catch up with
C. talk with
D. agree with
加油卡积分是中国石油为（）而开设的，只要您持中国石油个人记名加油卡加油，就可以积分。
A、丰富卡片内容
B、充值
C、持续回报广大客户
D、转账
