单词	84}--polonium {po
释义	polonium {Po， 84}钋
随便看	direct sequence spread spectrum {=dsss} direct sequence spread spectrum modulation direct-service agency direct service organizations direct service organizations (dsos) direct shadow photo direct sharing direct shear direct shear apparatus direct shear test direct shipment direct short-circuit direct side-force control direct smear direct solar effects direct solar irradiance direct solar radiation direct solution direct solution of geodetic problem direct sound direct sounder direct sound level in db direct sound level in db {=dbdir} direct sound pressure level direct sound pressure level {=ld}