[单选题] What is the heart of the lubrication system, which is located in the oil pan on the bottom of the engine? And it pulls oil up from the oil pan and makes the engine oil circulate through the engine.

1、[单选题]A latch mechanism is inserted into the slot in the output shaft in the manual transmission, so as to lock the drive wheels and keep them from turning, thereby preventing the vehicle from rolling. Which gear does the statement indicate?

• A、The fifth gear
• B、The parking
• C、 The neutral
• D、The reverse

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2、[单选题]Spark timing is so critical to an engine’s performance that most modern cars use a sensor to tell the engine control unit(ECU) __ .
l.

• A、the exact temperature of the spark plugs.
• B、the exact position of the pistons.
• C、 the exact location of the coi

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3、[主观题]【翻译】润滑系的机油泵从油底壳抽出机油 并把机油输送给发动机的所有工作部件。机油从油底壳流进流出.因而在油底壳和发动机的工作部件之间就有机油定向循环流动。

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4、[主观题]【翻译】No.4 piston is always performing the companion stroke to No.1: when the inlet valve in No.4 cylinder is fully open, No.1 cylinder inlet valve is fully closed --- this feature is useful to remember when checking valve clearances.

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5、[主观题]【翻译】连杆小头与活塞销连接，连接处有像青铜这样软金属制成的衬套，连杆下端连接在曲柄轴径上，称为连杆大头。

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