formative cause造句怎么写

The paper introduces the condition of the continuous high voltage during1999 dry season of Hubei Main Network, analyzes the formative cause, describes the treatment methods in other province and provids suggestion to restrain high voltage and improve reactive voltage in Hubei Network.

This paper analyses the formative cause of the crime from the aspects of biology, psychology and action.

At last, vacuum circuit breaker switching capacitance group overvoltage formative causes and electrode refining for lessening reignition are discuss.