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單項(xiàng)選擇題

Engage the flywheel with the （）.

A.turning gear
B.motor
C.driving gear
D.driven gear

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單項(xiàng)選擇題

Energy losses due to （） occur in every machine.

A.speed
B.friction
C.impact
D.atmosphere

單項(xiàng)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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