易生成铵盐的设备有()。
A.高压反应水冷器
B.低压反应水冷器
C.氧化氮分离器
D.氧化氮压缩机
参考答案:B, C, D
—Can you come to have dinner with me this evening?
—I'm afraid not. I _____ take care of my grandmother. She is ill. [ ]
A. can't
B. have to
C. may
D. could
企业纳税年度发生的亏损,准予向以后年度结转,用以后年度的所得弥补,但结转年限最长不得超过3年。( )