What, in your view, makes a text a text, rather than a series of unconnected utterances? What are the implications of your answer for second language teaching?
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
皮皮学刷刷变学霸
举一反三
【单选题】在由Na 2 S、Na 2 SO 3 、Na 2 SO 4 组成的固体混合物中,已知硫元素的质量分数为25.6%.则氧元素的质量分数为( )