道路分隔带兼作公共车辆停靠站台或供行人过路临时驻足之用时，宽度应在( )m以上。
A．1.0
B．1.5
C．2.0
D．2.5
参考答案：C
— Will you please stay here for the party?
— Sorry, I _____. I'll have to go to an important meeting. [ ]
A. mustn't
B. needn't
C. can't
D. won't
装置生产抗冲共聚产品时，为什么要加IPA？
