[单选题]承重砖墙的单层厂房适用于下列跨度及起重吨位的厂房( )

A、L≤15m Q≥50KN
B、L≤15m Q≤50KN
C、L≥18m Q≥50KN
D、L≤18m Q≤50KN

参考答案： B

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● （）any cae or upected cae of quarantinable dieae，or any cae of eruptive dieae or any death be dicovered，the local quarantine officer mut be notified immediately．
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