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单选题
Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）
A
The coolant temperature must be maintained at 180℃
B
The thermostatic bypass valves must be manually opened before the engine is started
C
The pressure cap must be removed while the engine is secured
D
Electrical power to the heater must be secured before the cooling system is drained
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更多 “单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）A The coolant temperature must be maintained at 180℃B The thermostatic bypass valves must be manually opened before the engine is startedC The pressure cap must be removed while the engine is securedD Electrical power to the heater must be secured before the cooling system is drained” 相关考题
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单选题Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out （）A
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单选题Rule 14 describes the action to be taken by vessel meeting head-on. Which of the following conditions must exist in order for this rule to apply?（）.A
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special precautions to deal with heatB
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emergency escapesD
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单选题Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）A
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单选题Which of the following precautions should always be carried out in dry dock?（）A
Liquids should never be transferred between tanks without consulting the dock masterB
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单选题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 fuelB
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The heating steam must be secured before the diesel oil passes through the three-way valve
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