【单选题】【消耗次数：1】
梁式桥的受力特点是（ ）。
①
在竖向荷载作用下有水平反力，有弯矩
②
在竖向荷载作用下无水平反力，无弯矩
③
在竖向荷载作用下有水平反力，无弯矩
④
在竖向荷载作用下无水平反力，有弯矩
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