造成丙烯、氨进料波动的可能原因有（）等。
A、吸收水温度波动
B、相关调节阀故障
C、相关仪表参数整定不当
D、进料带液
参考答案：A, B, C, D
The lawyer seldom wears anything other than a suit ______ the season.
A．whatever
B．wherever
C．whenever
D．however
牛肉松罐头
