【单选题】【消耗次数：1】
下列叙述正确的是（）。
①
脂肪类食物使胃排空速率增加
②
β受体阻滞剂，使胃排空速率减慢
③
胃内容物增加，胃排空速率增加
④
肾上腺素受体激动剂，使胃排空速率增加
⑤
抗胆碱药使胃排空速率减慢
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