One of the differences between a two-stroke engine and a four-stroke engine is,（） A: a two-stroke engine works without exhaust operation B: a two-stroke engine works without compression stroke C: a two-stroke engine works without expansion stroke D: a two-stroke engine works without suction operatio

There are two kinds of stroke, and they are ischemic stroke and hemorrhagic stroke.

The two-stroke cycle begins with the piston coming up from the bottom of its stroke， with scavenge ports in the sides of the cylinder being （）.

It is a verified fact that the higher ____<br/>of a two-stroke engine, the higher _____. A: the engine efficiency…the<br/>stroke/bore ratio B: the stroke/bore ratio…the<br/>engine efficiency C: the bore / stroke ratio…the<br/>engine efficiency D: the engine efficiency…the<br/>bore / stroke ratio

Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）

In the four-stroke engine, it takes( )to make one<br/>power stroke() A: one propulsion B: two propulsions. C: two revolutions D: one revolution

A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke A.① B.② C.① and ② D.Neither ① nor ② is correct

Four strokes—intake stroke, compression stroke, power stroke and exhaust stroke—complete one working cycle．

词汇题：There are eight basic strokes: dot, horizontal stroke, turning stroke, vertical stroke, hook stroke, right-upward stroke, left-downward stroke and right-downward stroke. 英译汉。注意标点。 汉字有八个基本笔画/八大笔画：____________________

Paragraph 2（） A: Effects of a stroke B: Annual cost of stroke in the US C: Definition and description of a stroke D: Breakthroughs in treatment E: Risk factors of stroke F: Warning signs of a stroke