【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 。
【单选题】汽车抛锚后,不宜长距离着地高速拖拽,是为了 。
【判断题】黄绿色起毛布料: 漫反射:197、180、69、37、166、197; 反射:反射光泽度:0.8;细分:25;打开“菲涅耳反射”; 折射:折射率:2.5 双向反射分布函数:沃德; 贴图/反射:反射值:80; 凹凸:凹凸值:150; 置换:细胞:细胞参数/细胞颜色:变化31.4;分界颜色:亮度都为0;细胞特性:圆形/大小:0.1/扩散:0.86/凹凸平滑:0.33;阀值:低:0.06/中:0.27;...
【单选题】When turning a large, slow –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 preheater should be gradually reduced after switching over the three-way valve
C.
The heating steam to the preheater 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