属于吞噬细胞非依氧杀伤系统的物质有( )
A．溶菌酶B．NOC．MPO杀菌系统D．乳铁蛋白E．弹性蛋白酶
参考答案：A,D,E
—Excuse me. Which is the way ______ the post office, please?
—Sorry, I don't know. You can ask the policeman _______ help. [ ]
A. to; to
B. to; for
C. for; for
D. for; to
对拟采购的供应商及外部服务方的评价及选择包括：对方的（）、质量保证能力、质量和服务承诺性能参数等技术指标是否满足检测需要、性价比情况等。
A、资格证明
B、检验报告
C、检定证书
D、校准证书
