[单选] When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）

A . The diesel oil must never be allowed to mix with the heavy fuel
B . The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve
C . The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve
D . The heating steam must be secured before the diesel oil passes through the three-way valve

下列属于阎立本的肖像画的有（）。《太宗御容》。《昭陵列像》。《窦建德像》。《永徽朝臣图》。铝酸钠溶液碳酸化分解主要目的是什么？ There is sufficient anchorage for（）at all time around the No.1 buoy and for smaller vessels around the No.4 buoy. deep laded vessels。 deeply load vessels。 deep loading vessels。 deeply loaded vessel。船舶在靠泊中发生火灾，全体船员在紧急应对的同时还应及时向当地的海事机构。二米传派的代表人物是（）。李成。吴镇。高克恭。方从义。 When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）

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[单选] When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）

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