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【单选题】
【§2.1】机械设备故障,按故障影响的严重程度分( )。A.
磨损性故障，使用性故障，先天性故障，渐发性故障
B.
渐发性故障，突发性故障，潜在性故障，功能性故障
C.
潜在故障，功能故障，轻微故障，一般故障
D.
轻微故障，一般故障，严重故障，恶性故障
E.
一般事故、大事故、重大事故
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皮皮学刷刷变学霸
举一反三
【简答题】Finally, a few words about our new ____ 5____ .
【简答题】Many people wrongly believe that when people reach old age, their families place them in nursing homes.They are left in the 1 of strangers for the rest of their lives.Their 2 children visit them only ...
【单选题】A much more common problem with old people's health is ______.
A.
their fear of becoming old
B.
the illness
C.
old people's depression
D.
over-medication
【简答题】A．Retirement age. B．Old people's health. C．Keeping health. D．Old people's salary.
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