环管工艺高压丙烯洗涤塔的丙烯回流泵一般可采用()泵。
A、往复
B、高速
C、离心
D、轴流
参考答案:C
—What did the teacher said just now?
— He told the students _____ any food into the computer room.[ ]
A. not to bring
B. not bring
C. don't bring
D. bring not
He was too _____ to cut himself with the knife.[ ]
A. careful
B. carefully
C. careless
D. care