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【判断题】
该零件图采用了 4 个视图表达闷盖,其中一个主视图、一个左视图,一个俯视图、一个向视图。A.
正确
B.
错误
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举一反三
【单选题】Scarcity exists for those with
A.
lower incomes.
B.
average incomes.
C.
higher incomes.
D.
all of the above.
【简答题】(拉压) 根据强度条件σ≤[σ]可以进行( )、( )、( )三方面的强度计算。
【单选题】Scarcity is
A.
our inability to satisfy all our wants.
B.
a situation that exists during economic recessions but not during economic booms.
C.
eliminated by choices.
D.
an economic problem only for poor people.
【单选题】Scarcity:
A.
occurs only in centrally planned economies.
B.
will likely be eliminated by technological progress.
C.
exists only in poor nations.
D.
occurs if there are insufficient resources to provide for human wants.
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