专四专八考试
解析:The plumb line is always perpendicu
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【单选题】The plumb line is always perpendicular ______ the horizontal plane.
A. with
B. from
C. at
D. to
网考网参考答案:
D
网考网解析:
perpendicular to固定搭配,意为“与……成直角,垂直” document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block";
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