调和显示剂时，粗刮可调得稀些，精刮应调得干些。
参考答案：对
William Wordsworth is a poet in memory of the past. To him, life is a cyclical journey. Its beginning finally turns out to be its end. His philosophy of life is presented in his masterpiece ______.
A. The Prelude B. My Heart Leaps upC. Tintern Abbey D. The Solitary Reaper
干燥空气氧气含量为（），氮含量为（）。
