單項選擇題鋼筋焊接網(wǎng)安裝時,下層鋼筋網(wǎng)需設置保護層墊塊,其間距應根據(jù)焊接鋼筋網(wǎng)的規(guī)格大小適當調整,一般為()

A.5~10mm
B.50~100mm
C.100~200mm
D.500~1000mm