钢筋混凝土预制桩采用重叠法制作，重叠的层数一般不宜超过四层。_爱下问搜题

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问题填空题

钢筋混凝土预制桩采用重叠法制作，重叠的层数一般不宜超过四层。上层桩或邻桩的浇筑，应在下层桩或邻桩混凝土达到设计强度的（）以后方可进行。

答案

参考答案：30%

单项选择题

Questions 24-30

·Look at the questions for this part.
·You will hear a passage about "Marriage Customs in the U.S. ". You will listen to it twice.
·For questions 24-30, indicate which of the alternatives A, B, or C is the most appropriate response.
·Mark one letter A, B, or C on the Answer Sheet.

The roundness of the ring represents ______.

A．eternity and the unity of the couple

B．beginning and quality of the couple’s life

C．all of the above

问答题简答题

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