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A faulty thermostatic bypass valve, in a diesel engine cooling system, can result in （）

A.excessive time required for warming-up
B.excessive freshwater corrosion
C.scale formation on the saltwater side
D.saltwater mixing with the freshwater

單項(xiàng)選擇題

Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）

A.changes the position of the fuel inlet ports
B.changes the length of the pump stroke
C.varies the quantity of fuel delivered
D.varies the compression of the delivery valve spring