PM 音標拼音: [p'i'ɛm]
相位調制
相位調制
PM n 1 :
an examination and dissection of a dead body to determine cause of death or the changes produced by disease [
synonym :
{
autopsy }, {
necropsy }, {
postmortem }, {
post -
mortem }, {
PM },
{
postmortem examination }, {
post -
mortem examination }]
2 :
a soft silvery metallic element of the rare earth group having no stable isotope ;
was discovered in radioactive form as a fission product of uranium [
synonym : {
promethium }, {
Pm },
{
atomic number 61 }]
3 :
the person who holds the position of head of the government in the United Kingdom [
synonym : {
Prime Minister }, {
PM },
{
premier }]
4 :
modulation of the phase of the carrier wave [
synonym : {
phase modulation }, {
PM }]
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