單項(xiàng)選擇題The opening or closing of the cylinder starting valve is controlled by （）.

A.the starting air distributor
B.the cut-off valve on the air main
C.the main starting valve
D.the air bottle control valve


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2.單項(xiàng)選擇題Cylinder wall temperature, fuel oil supplier, and oil passage （）.

A.are interdependent
B.are not interdependent
C.have nothing to do with each other
D.are independent

3.單項(xiàng)選擇題The development of oils （） the increasing demands made by the steady rise in powers produced by modem diesels.

A.has kept pace with
B.has kept pace to
C.has made pace with
D.has made pace to

4.單項(xiàng)選擇題（）the compression ratio, （） the proportion of the heat energy of the combustion turned into useful work at the crankshaft, other things being equal.

A.The high；the large
B.The higher；the larger
C.The lower；the larger
D.The low ；the large

5.單項(xiàng)選擇題（） the cylinder walls, the heat passes through them by conduction.

A.When receiving by
B.When received by
C.In order to receiving
D.In order to receive