Which of the following is not a state function? A: Internal energy B: Free energy C: Work D: Enthalpy

Fuel cell is more promising than solar energy and wind energy because it is free from environmental restrictions and pollution.

A photon having 40 keV scatters from a free electron at rest. What is the maximum energy that the electron can obtain? (  )

A fixed relationship exists between the standard free-energy change of a reaction, ΔGo, and its equilibrium constant K.

系统中物质的总能量可分为束缚能(bond energy)和自由能(free energy)。束缚能是不能做的能量，而自由能可以在条件下做最大有用功(非膨胀功)

The use of robots increases （） A: too much energy B: based on American designs C: they are too costly D: they are not reliable E: quality control F: free of charge

One disadvantage of using robots is that they consume （） A: too much energy B: based on American designs C: they are too costly D: they are not reliable E: quality control F: free of charge

The main technical fields of intelligent power generation are () . A: Renewable Energy; New Energy; Large Capacity Energy Storage<br/>Application B: Conventional Energy; Renewable Energy; Clean energy C: Conventional Energy; Renewable Energy; Clean Energy D: New Energy; Clean Energy; Large Capacity Energy Storage Application

The main technical fields of intelligent power generation are （ ） 。 A: Conventional Energy; Renewable Energy B: New Energy; Clean Energy; Large Capacity Energy Storage Application C: Conventional Energy; Renewable Energy; Clean Energy D: Renewable Energy; New Energy; Large Capacity Energy Storage Application

【多选题】Which of the following energy are storable A. photo energy B. potential energy C. sound energy D. chemical energy