关于钢管管道安装和接口质量检验，下列（）说法不正确。 ["A.沿管道每10m用水准仪检查管道高程和坡度，用尺量检查中线的偏离程度。 ","B.逐口检查，用量规量测接口焊缝坡口应符合相关的规定；逐口观察焊口焊接质量是否符合相关规定和设计要求。 ","C.法兰接口不能埋入土中。 ","D.钢管采用螺纹连接时，管节的切口断面应平整，偏差不得超过一扣，丝扣应光洁，不得有毛刺、乱丝、断丝，缺丝总长不得超过丝扣全长的10％。接口紧固后宜露出2～3扣螺纹。"]
Which three are characteristics of IPv6?（） [" An IPv6 address is 128 bits long."," An IPv6 header contains the header checksum field."," An IPv6 header is 20 bits long."," An IPv6 header contains the next header field."," IPv6 route rs send RA messages."," An IPv6 header contains the protocol field."]
消防验收一般遵循验收受理、现场检查、（）、结论评定、工程移交等顺序来进行。 ["最终验收","现场验收","中间验收","初步验收"]
除非法律另有规定，拟交付给被许可方的拷贝灭失的风险，包括以电子方式交付的拷贝，于电子信息交易合同成立时转移给被许可方。
下列钢结构的破坏属于脆性破坏的是（） ["疲劳破坏","轴压柱的失稳破坏","钢板受拉破坏","螺栓杆被拉断"]
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