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PR高，相关性低 PR低，相关性高 PR低，相关性低 PR高，相关性高
pR 22 > pR 12 > pR 134a pR 134a > pR 22 > pR 12 pR 22 > pR 134a > pR 12 pR 134a > pR 22 > pR 12
PR间期与心率成正比 PR问期与年龄成正比 PR间期常<0．12s PR间期<0．12s者占50％以上 以上都对
pa=pr+pn pr=pa+pn pr=pa； pa=pr—pn
CR CR+PR PR CR+PR+NC CR+PR+NC+PD
VSWR=（1+（Pr/P开平方）/（1-（Pr/P开平方） VSWR=（1-（Pr/P开平方）/（1+（Pr/P开平方） VSWR=（（Pr/P开平方+1）/（1+（Pr/P开平方） VSWR=（1+（Pr/P开平方）/（（Pr/P开平方-1）
shrinking cultural differences and new communication technologies increased efforts of other countries in public relations an unparalleled increase in the number of public relations companies the decreasing number of multinational corporations technologies
Pfr升高，Pr降低 Pfr降低，Pr升高 Pfr降低，Pr降低 Pfr升高，Pr升高
seventeen years old seventeen-year-old seventeen-years-old seventeenth-year old
PR间期与心率成正比 PR间期与年龄成正比 PR间期常<0.12s PR间期<0.12s者占50％以上 以上都对
Pfr/Pr高； Pfr/Pr低； Pfr/Pr适中； 与Pfr/Pr无关。
PR=15~PR=25 PR=25~PR=35 PR=35~PR=45 PR=14~PR=55
shrinking cultural differences and new communication technologies increased efforts of other countries in public relations an unparalleled increase in the number of public relations companies the decreasing number of multinational corporations technologies
promise profit procedure product
June seventeen June the seventeen
The seventeenth of June seventeenth of June
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