试题与答案

路堑开挖中横向台阶开挖适用于横坡部大于()的情况。A.1:2 B.1:5 C.1:8

题型:单项选择题

题目:

路堑开挖中横向台阶开挖适用于横坡部大于()的情况。

A.1:2

B.1:5

C.1:8

D.1:10

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析: 尿三氯化铁试验是检测尿中苯丙酮酸的化学呈色法,特异性欠佳,有假阳性和假阴性的可能,一般用于对较大儿童的初筛。

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