桥梁工程施工发现预应力锚具的质量证明资料不够齐全时，应按规范的规定进行静载（）试验。
A.初始应力
B.磨阻系数
C.滑动性能
D.锚固性能
参考答案：D
解析：
本题属于城市桥梁预应力施工基本知识，具有较强的实践性。《城市桥梁工程施工与质量验收规范》CJJ2规定：对大桥、特大桥等重要工程，或对质量证明资料不齐全、不正确及质量有疑点锚具，应进行静载锚固性能试验。
在通过外观和硬度检验的同批中抽取6套锚具（夹片或连接器），组成3个预应力筋锚具组装件，由具有相应资质的专业检测机构进行静载锚固性能试验。如有一个试件不符合要求，则应另取双倍数量的锚具（夹具或连接器）重做试验，如仍有一个试件不符合要求，则该批产品视为不合格品。
对用于中小桥梁的锚具（夹片或连接器）进场验收，其静载锚固性能可由锚具生产厂提供试验报告。
由此可知，D项为正确选项。其他三项显然是干扰项。
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| People _1_ at the moon and written poems about it for thousands of years, but nobody expected to go _2 1961 when Yuri Gagarin made the first manned space flight. Then the Americans decided to send a man to the moon . Apollo 11 took off _3_ 16 July , 1969. The moon is 238,900 miles from Earth and the journey _4 _ four days . On 21 July, Neil Armstrong 5_ the first man to walk on the moon. The astronaut in the pictures of the first moon landing isn't Neil Armstrong. The photos show the second man to walk on the moon , Buzz Aldrin. That's _6 Armstrong took the photos ! There were six manned missions to the moon between 1969 and 1972 , and 12 people _7_ on the moon . No astronauts have been to the moon _8_ 1972. We've learnt a lot about the moon because of these missions. For Example, we know that there's no life there. _9_ has ever lived on the moon, but some scientists think that people will live on the moon one day . Life on the moon 10 easy. It will be a difficult and dangerous place to live.
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