Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes are （） or if any soldered joints exit.<br>A:chromed<br>B:welded<br>C:galvanized<br>D:bolted

Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes are （） or if any soldered joints exit.
A:chromed
B:welded
C:galvanized
D:bolted

出自：海船船员证

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