中级
A.A its relationship with employees at the mine
B.B its access to the raw materials neede
C.C the methods it designed for checking safety in the mine
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A.A air transport has limited capacit
B.B the road networks are underdevelope
C.C the seaport is too far away,
A.A is owned by a workers' co-operativ
B.B was established by a haulage company,
C.C has financial support from the governmen
A.A do not reach the required standard,
B.B are not accompanied by a guarante
C.C do not match product specification
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