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某工地，一民工在开搅拌机，开了半小时后，他发现地坑内砂石较多，于是将搅拌机料斗提升到顶，自己拿铁锹去地坑挖砂石，此时料斗突然落下，将张某砸成重伤。请判断下列事故原因分析的对错。 (1)未切断电源。( ) A.正确 B.错误 (2)将料斗提升后，未用铁链锁住。( ) A.正确 B.错误 (3)作业前，未进行料斗提升试验。( ) A.正确 B.错误 (4)离合器、制动器失灵，未检查。( ) A.正确 B.错误
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He can’t live with his father.
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His father has no friends.
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