斗式提升机的头部轴装有一个(),用于防止设备意外停机时倒转产生事故。
参考答案:逆止器
写作。
以My favorite animal为题描述你最喜欢的动物,文章必须回答以下问题。(60-80词):
What's your favorite animal?
What does it eat?
What do you do for it?
Do you often take it for a walk?
My Favorite Animal
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农林特产税的征收范围是什么?