多缓冲剂
参考答案：
是一系列等电点既相异又相近的具有多胺基，多羧基的脂肪链化合物构成的。
His oversight of the danger that resulted in two deaths and five wounded in the expedition was _________ criminal.
A．no less than
B．not less than
C．nothing less than
D．less than
施工现场应明确划分用火作业、易燃材料堆放，仓库、易燃废品集中站和生活区等区域
