【名词&注释】
压缩比(compression ratio)、加热炉(heating furnace)、阻火器(flame arrester)、往复式压缩机(reciprocating compressor)、磁力泵(magnetic pump)、无泄漏(non-leakage)
[单选题]P-301为磁力泵(magnetic pump),其特点是()
A. A、无泄漏(non-leakage) B. B、投资少 C. C、故障少