Allowances may be made for the expansion and contraction in pipi

  • 2024-01-21 14:23:08
  • YY6

Allowances may be made for the expansion and contraction in piping by the use of expansion joints or ______.

A.unions

B.retractable flanges

C.union bulkhead fittings

D.bends or loops in the line

正确答案是B