What is the purpose of the intake/exhaust valves in a diesel engine? （）

[单选题]What is the effect of heated intake air on a diesel engine? （）A . Increases efficiencyB . Increases engine horsepowerC . Increases engine lifeD . Reduces engine horsepower

[单选题]What is the purpose of the text?A．To describe the job of a ROM．B．To provide information about ALRL．C．To announce an open position at ALRL．D．To make known the opening of the new laboratories．

[单选题]What is NOT the purpose of this music program？A．To study the language of music.B．To learn more about the music.C．To give a complete background to the music.D．To give people some music to listen to.

[单选题]What is the main purpose of the passage?A． To teach patients ways for quick recovery.B． To present a report on a scientific research.C． To show the importance of a good lifestyle.D．, To give information about a kind of medicine.

[单选题]What is the purpose of the Spanning Tree Protocol (STP)?A．To prevent routing loopsB．To create a default routeC．To provide multiple gateways for hostsD．To maintain a loop-free Layer 2 network topologyE．To enhance the functions of SNMP

[单选题]What is the main purpose of the passage?A．To show us the hidden beauty in our world.B．To warn us not to get lost in the fantasy wonderC．To argue against the misuse of the sense of wonderD．To discuss the influence of the world of make-believe

[单选题]What is the main purpose of the passage?A．To show us the hidden beauty in our world.B．to warn us not to get lost in the fantasy world.C．To argue against the misuse of the sense of wonder.D．To discuss the influence of the world of make-believe.

[单选题]What is the main purpose of this text?A． To call on people to pay more attention to housing problems.B． To prove that some standards are needed for affordable housing.C． To ask society to help homeless people and low-income families.D． To introduce h

[试题]What was the purpose of Goldman’s invention? (No more than 10 words)

[单选题]What is the author’s purpose in writing the passage?A．To give a prescription for insomnia.B．To urge people to sleep less.C．To analyze the sleep pattern of modern people.D．To throw new light on human sleep.