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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
2fT–fR或(fT+fR)/2 fT–fR或fT+fR 2(fT–fR)或2(fT+fR) 2fT或2fR
FR~Ⅰ型 FR~Ⅱ型 FR~Ⅲ型 FR~Ⅳ型 FR~Ⅴ型
1.1fr;0.80fr 1.15fr;0.80fr 1.1fr;0.85fr 1.15fr;0.85fr
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
efficient effective economic evident
FR-Ⅰ型 FR-Ⅱ型 FR-Ⅲ型 FR-Ⅳ型 口外弓
1.1fr;0.80fr 1.15fr;0.80fr 1.1fr;0.85fr 1.15fr;0.85fr
FR-Ⅰ型 FR-Ⅱ型 FR-Ⅲ型 FR-Ⅳ型 口外弓
e≤[e] e≥[e] FR≤[FR] FR≥[FR]
society can't provide enough jobs for properly trained college students high school graduates do not fit the pattern of college education too many students have to earn their own living college administrators encourage students to work hard
1.9Fr 3.0Fr 4.0Fr 5.0Fr 5.0Fr双腔
FR~I型 FR~Ⅱ型 FR~Ⅲ型 FR~Ⅳ型 FR~Ⅴ型