3. ~{NRCG6Wn4s5D@{RfV.R;>MJG8_?M;'VR3O6H#,Hg9{La8_?M;'1#3VBJ#(~}retention rate~{#)~}5%~{#,=+;aLa8_9+K>~} ~{@{Hs6`IY#?~}
A.1-10% B.11-25% C.25%-100%