【单选题】乙级防火窗的耐火极限为不低于_____。
【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 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
【单选题】When a larger, low speed, main propulsion diesel engine running on heavy fuel, which of the following precautions should be observed when changing 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
【单选题】汽车抛锚后,不宜长距离着地高速拖拽,是为了 。
【简答题】材料一:马克思主义是发展的理论,它随着社会实践的发展而发展。马克思主义在中国传播和发展的过程就是马克思主义中国化的过程,在这一过程中产生了思想、理论和“”重要思想。
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