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

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

出自：海船船员证

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