单选题 The two-stroke cycle engine, with one working or power stroke every revolution, will, theoretically, develop ______ the power of a four-stroke engine of the same swept volume.

单选题 The four-stroke engine is used for auxiliaries such as alternators and sometimes for main propulsion with ______ to provide a propeller speed of between 80 and 100 rev/min.

单选题 Shims of different thickness are inserted between the shells to enable adjustment of ______.

单选题 Fuel to be used is first transferred from storage tanks to a ______ in which it is heated to allow some water and sludge to settle out by gravity and be drained off.

单选题 The engine is also provided with ______ which is designed to regulate the engine’s speed by adjusting the quantity of oil injected.

单选题 Why are the scavenging ports are drilled in the liners at a certain angle?

单选题 What is the function of tie rods?

单选题 During working, when the piston is near the ____, the air ignites the fine spray of fuel.

单选题 The sequence of parts in a generally used fuel oil supply system for a main engine is ____. ①tanks in the double bottom;②centrifuges;③service tank;④settling tank;⑤viscosity regulator