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人均GDP=500；PU＝35% 人均GDP=1000；PU＝60% 人均GDP＝3000；PU＝70% 人均GDP=5000；PU＝55% 人均GDP=10000；PU＝70%
as much as half half as much as as many as half half as many as
PU=UP PU=U/P PU=P/U PU=（U+P）/（U-P）
sign signal guarantee marks
±0.001pu ±0.002pu ±0.003pu ±0.005pu
人均GDP＝500；PU＝35% 人均GDP＝1000；PU＝60% 人均GDP＝3000；PU＝70% 人均GDP＝5000；PU＝55% 人均GDP＝10000；PU＝70%
1/P=1/PU+1/PV+1/PW P=PU+PV+PW P=PU•PV•PW P=（PU+PV+PW）
PU=U/P PU=P/U PU=UP PU=(U+P)/(U-P)
PU—402前的过滤器堵塞 PU—402后的管道堵塞 回流阀开度太大
Pu=Pm-9dB Pu=Pm+9dB Pu=Pm+8.686dB Pu=Pm-8.686dB
PA+pC+pUpCpApGpU PApG+pUpC+pApGpU 2pA+2pG+2pU+pC PApGpUpCpA+pG+pU PApGpUpCpApG+pU
as much as half as many as half half as much as half as many as
RESTORE SCREEN FROM PN SAVE SCREEN TO PU SAVE ALL TO PU SESTORE FROM PU
Pu和
Pu都含有94个中子 Pu和Pu互为同位素 Pu和Pu的核外电子数不同 Pu和Pu分别含有146和147个质子
1／ P- 1／ Pu+1／ Pv4+1／ Pw P=Pu+Pv+Pw P=Pu·Pv·Pw P=（Pu+Pv+Pw）／√3
1/P=l/PU +1/PV +1/PW P=PU +PV +PW P= PU · PV · PW P=（PU +PV +PW ） / 3
educated persons the children themselves teachers parents
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