Such thrifty sorts may also constantly cadge cigarettes, rather than buying their own, or regularly borrow cash for bus fares, but rarely pay it back.

Based on SPWM basic principle and Fourier series theory, the mathematical model of output waveform of SPWM voltage source inverter is built.

The research on geochemical characteristics and isotope age suggests that the deposit belongs to a magma-metasomatic pegmatite type deposit related to Fufang and Huitong granitic mass in genesis.