Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes are or if ally soldered joints exit.A.chromedB.weldedC.galvanizedD.bolted
Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes are or if ally soldered joints exit.
A.chromed
B.welded
C.galvanized
D.bolted
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根据英文名（Sodium）写出对应的中文名。