5吨煤平均分成7堆，每堆占5吨煤的请选择DCBA.j3V:y3F)n0a7P7Z,x.t;B-M*|-F'_;u0h2u
A．1/5.t;B-M*|-F'_;u0h2u
B．1/7.t;B-M*|-F'_;u0h2u
C．1/7吨.t;B-M*|-F'_;u0h2u
D．5/7吨.t;B-M*|-F'_;u0h2u