A:PHB是一种聚酯
B:PHB的单体是CH3CH2CH(OH)COOH
C:PHB的降解产物可能有CO2和H2O
D:PHB通过加聚反应制得
在尼泊尔地震中,某人因伤失明,经检查发现其形成视觉的神经中枢受损,该中枢在( )
— Mr. Hurst, could I join in your after-class activity from tomorrow on?
— Of course, Jenney. You can come every Tuesday and Friday afternoon.
读人口出生率与死亡率统计图,回答题。