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used to is used for is used as is used to
Fi=Fc-Fl Fi=Fl-Fc Fl=Fc-Fi Fl=Fi-Fc
is used to produce is used to producing used to produce used to producing
as many as he used to as many as he was used to as much as he used to as much as he was used to
used to have used to be was used to being was used to have
used to have used to be are used to be used being
是 不是 FI231是FI241不是 FI241是FI231不是
FIAL540 FI128 FI148 FI168
So many; used to be So much; is used to being Too many; used to be Too much; used to
Ft≥Ff+Fw+Fi+Fj Ft=Ff+Fi+Fj Ft>Ff+Fw+Fi+Fj Ft＜Ff+Fw+Fi+Fj
used to be；smoking used to have；smoking used to be；smoke used to have；smoke
So many; used to be So much; is used to being Too many; is used to be Too much; used to be
PaO2/Fi0>300 200200PaO2/Fi0<200 PaO2/Fi0<100
used to is used for is used as is used to
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