# Intake and exhaust occur at bottom dead center.

The four-stroke cycle 1 = TDC 2 = BDC < span style =" margin: 1px ; background-color: # 10ff00 ;"> A: Intake </ span > < span style =" margin: 1px ; background-color: # ffae21 ;"> B: Compression </ span > < span style =" margin: 1px ; background-color: # ff0000 ;"> C: Power </ span > < span style =" margin: 1px ; background-color: # 639eff ;"> D: Exhaust </ span >

# REDIRECT Dietary Reference Intake

# REDIRECT Dietary Reference Intake

# REDIRECT Dietary Reference Intake

# Compression stroke: Fuel-air mix is compressed and ignited.

# Power stroke: Piston is pushed downward by the hot exhaust gases.

# Compression stroke: Fuel vapor and air are compressed and ignited.

# Combustion stroke: Fuel combusts and piston is pushed downwards.

# Exhaust stroke: Exhaust is driven out.

# stroke line style and color ( possibly transparent )

* Chip stroke or chip-in, a type of golf shot ( see Golf # Stroke mechanics )

Two-input TTL Sheffer stroke # NAND gate | NAND gate with a simple output stage ( simplified ).

# G, for characters with last stroke of 橫 ( héng )

# H, for characters with last stroke of 竪 ( shù )

# T, for characters with last stroke of 撇 ( piě )

# Y, for characters with last stroke of 捺 ( nà )

# N, for characters with last stroke of 折 ( zhé )

# F, for characters with last stroke of 橫 ( héng )

# J, for characters with last stroke of 竪 ( shù )

# R, for characters with last stroke of 撇 ( piě )

# U, for characters with last stroke of 捺 ( nà )

# B, for characters with last stroke of 折 ( zhé )

# D, for characters with last stroke of 橫 ( héng )

# K, for characters with last stroke of 竪 ( shù )

# E, for characters with last stroke of 撇 ( piě )

# I, for characters with last stroke of 捺 ( nà )

# V, for characters with last stroke of 折 ( zhé )

# REDIRECT Sheffer stroke

# REDIRECT Air force

Royal Australian Air Force | RAAF General Dynamics F-111 | F-111 performing a Fuel dumping # Dump-and-burn | dump-and-burn Fuel dumping | fuel dump at the Australian International Airshow

# REDIRECT Clean Air Act ( United States )

# Air strike: Use the US Air Force to attack all known missile sites.

# redirectIntegrated NATO Air Defense System

# Ali Al Salem Air Base

# Ahmed Al Jaber Air Base

# REDIRECT Air Force Space Surveillance System

# Air pressure from the lungs creates a steady flow of air through the trachea ( windpipe ), larynx ( voice box ) and pharynx ( back of the throat ).

# REDIRECT Air gun

# Thin Air ( 1995 ; adapted into A & E TV movie )

# REDIRECT United States Air Force

# REDIRECT United States Air Force

# Proof of Principle: First developments towards trading of emission certificates based on the " offset-mechanism " taken up in Clean Air Act in 1977.

# Prototype: Launching of a first " cap-and-trade " system as part of the US Acid Rain Program in Title IV of the 1990 Clean Air Act, officially announced as a paradigm shift in environmental policy, as prepared by " Project 88 ", a network-building effort to bring together environmental and industrial interests in the US.

# REDIRECT Gulf War # Air campaign

In 1994 / 5, the Air Force published a report which concluded that Mogul Flight # 4, launched from Alamogordo, New Mexico, on June 4, 1947, was what crashed near Roswell, New Mexico, and formed the source of the debris which sparked the Roswell UFO Incident.

# Bel Air ( 1965 )

# Cresaptown-Bel Air ( a combination of the communities of Cresaptown and Bel Air recognized as a unit by the Census Bureau )

# REDIRECT United States Air Force

# REDIRECT Special Air Service