土壤质地
参考答案：
土壤中沙粒、粉粒和黏粒的含量比例。
In relation to the law of contract, explain how parties may be deemed to be bound to each other on the basis of quasi-mutual assent. (10 marks)
止水的失效，不仅造成闸门严重漏水，还带来哪些危害？
