消防员灭火防护服的主要用途及要求是灭火作业时的身体防护，采用薄型隔热层和透气、耐洗涤性能好的材料。
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外电网采集机采样位置在机械室电源箱闸刀上方。
A. 正确
B. 错误
A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.
A. mechanical energy to kinetic energy to potential energy
B. mechanical energy to potential energy to kinetic energy
C. potential energy to mechanical energy to kinetic energy
D. kinetic energy to mechanical energy to potential energy
磺胺增效剂药物是（）
A. 磺胺嘧啶
B. 甲硝唑
C. 甲氧苄啶
D. 诺氟沙星
E. 磺胺米隆
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