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【简答题】
有些计算机对表达式的运算处理过程实行“后缀表达式”：运算符号紧跟在运算对象的后面，按照从左到右的顺序运算，如表达式 ，其运算为： ，若计算机进行运算： ，那么使此表达式有意义的 的范围为 _____________ ．
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【单选题】They made every effort to______the costs of the construction project.
A.
bring off
B.
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C.
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D.
bring up
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A.
They made every effort to ____their argument. A．protect
B.
judge
C.
defend
D.
hold
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