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FR～Ⅰ型 FR～Ⅱ型 FR～Ⅲ型 FR～Ⅳ型 FR～Ⅴ型
FR1—FR64 FR1—FR70 FR1—FR77 FR1—FR87
FR～Ⅰ型 FR～Ⅱ型 FR～Ⅲ型 FR～Ⅳ型 FR～Ⅴ型
FR～Ⅰ型 FR～Ⅱ型 FR～Ⅲ型 FR～Ⅳ型 FR～Ⅴ型
FR1为4A，FR2为4.5A，FR4、FR5为4A FR1为4.5A，FR2为5A，FR4、FR5为4A FR1为4A，FR2为4.5A，FR4、FR5为5A FR1为4A，FR2为4.5A，FR4、FR5为4.5A
FR-Ⅰ型 FR-Ⅱ型 FR-Ⅲ型 FR-Ⅳ型 FR-Ⅴ型
much healthier better no healthier less healthier
high price economic decline bad service poor quality
1.1fr;0.80fr 1.15fr;0.80fr 1.1fr;0.85fr 1.15fr;0.85fr
Because people think they are much healthier. Because they are more delicious. Because people prefer organic food. Because they sell better.
1.9Fr 3.0Fr 4.0Fr 5.0Fr 5.0Fr双腔
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