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Qhov sib txawv ntawm qhov hluav taws kub tsis kam ntawm qhov rooj hluav taws: lub qhov rooj hluav taws tau muab faib ua A, B, C, uas yog qhov kev tiv thaiv hluav taws kub ntawm lub qhov rooj hluav taws, uas yog, lub sijhawm hluav taws kub, tus qauv tam sim no yog kev tiv thaiv hluav taws. lub sij hawm tsis tsawg tshaj 1.5 teev, chav kawm B tsis tsawg tshaj 1.0 teev, chav kawm C tsis tsawg tshaj 0.6 teev.

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