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 （）.
A.8-10℃ B.10-12℃ C.10-15℃ D.10-20℃
单项选择题 The opening or closing of the cylinder starting valve is controlled by （）.
单项选择题 Suppose the rated capacity of the main engine of a ship is 10,000 KW at 100 rated rpm, then when at 80 rpm its capacity should be （）.
单项选择题 Cylinder wall temperature, fuel oil supplier, and oil passage （）.
