单项选择题
A.the bottom of the column；the cylinder blocks
B.the top of the column；the cylinder heads
C.the top of the column；the cylinder blocks
D.the bottom of the column；the cylinder heads
单项选择题 As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.
单项选择题 The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.
单项选择题 The opening or closing of the cylinder starting valve is controlled by （）.