试题与答案

节流件的端面应垂直于管道轴线,其允许偏差为( )°。A.1 B.3 C.5 D.1

题型:多项选择题

题目:

节流件的端面应垂直于管道轴线,其允许偏差为( )°。

A.1

B.3

C.5

D.10

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析:表达式a×(b+c)-d的后缀表达式为abc+xd-。注意运算符号的优先级,可通过按层序遍历方式将运算符及操作数写入二又树中,然后后序遍历该二叉树即得。

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