平视镜头
水滴在原油中的沉降速度与()、油水密度差及重力加速度成正比,与原油的粘度成反比。 水滴直径的平方。 水滴直径的三次方。 水滴直径的四次方。 水滴直径的二分之一次方。
下列哪种细胞器与细胞壁的形成有关() 高尔基体。 线粒体。 肉质网。 核糖体。
A tank 36 ft. by 36 ft. by 6 ft. is filled with water to a depth of 5 ft. If a bulkhead is placed in the center of the tank running fore-and-aft along the 36-foot axis,how will the value of the moment of inertia of the free surface be affected?() The moment of inertia would remain unchanged。 The moment of inertia would be 1/4 its original value。 The moment of inertia would be 1/2 the original value。 None of the above。
气层的含气饱和性能称为() 绝对饱和率。 相对饱和率。 饱和率。 渗透率。
The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the ().