researchers have collected enough data on child maltreatment． more than 31，000 children under 15 are killed every year． many countries have set up special institutions for maltreated children． some children are also to blame for mal treatment．
Routine supervisory labor particularly the unproductive night-service labor isreduced Engine mal-operation is automatically sensed and manned The engine room need be manned at night in bad weather or close waters Some remedial measures can be taken automatically
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