单项选择题
Energy losses due to （） occur in every machine.
A.speed
B.friction
C.impact
D.atmosphere
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
