铸造是一种金属热加工工艺,是将熔融的金属注入、压入或吸入铸模的空腔中使之成型的加工方法。铸造作业过程中存在着多种危险有害因素,下列各组危险有害因素中,全部存在于铸造作业中的是()。
A
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Acartravelsatarateof50milesperhour.Howlongwillittaketotravel300miles?
many,minutes,hour,there,how,are,in,an
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()What'sthat____English?
Thenumberofsecondsinoneday_____Thenumberofminutesinoneweek
He______anyauntsoruncles