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單項選擇題

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

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單項選擇題

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

單項選擇題

Either a low injection pressure or a leakage of piston rings is able to lead （）.

A.a high exhaust temperature
B.a high smoky exhaust
C.a high output
D.a high compression