拱桥桥台的主要类型有哪几种?
拱桥桥台的主要类型有六种: ①重力式U型桥台; ②组合式桥台; ③轻型桥台; ④空腹L型桥台; ⑤履齿式桥台; ⑥屈膝式桥台。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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