【简答题】Explain why addition of HNO 3 to concentrated H 2 SO 4 results in the formation of and ions. How could one test experimentally to confirm that such ions exist in H2SO4 solution?
【单选题】Which of the following promises constitutes sufficient consideration in the formation of a contract?
A.
To reimburse the cost of refurbishing a house where the promise in made after the refurbishing has been completed
B.
To lease a house at an annual rent significantly below current market rates
C.
To pay a witness an agreed monetary sum in exchange for attending court
D.
To pay a worker extra remuneration in exchange of continuing to perform their existing contractual duties
【单选题】In the rostrocaudal patterning of nervours system, which of the following molecule plays a key role in the formation of MHB.
【简答题】14《寂静的春天》第1课时作业 1.打开学习通课程--语文--章节,阅读这篇课文的原文及扩展阅读内容,课文读三遍。 2.抄写词语:写在自己作业本上拍照上传学习通。本课的重要字词,每词加拼音抄写3遍。 3.本文可以分为几个部分?请分析说明。 4.打开学习通-语文-资料(或章节),打开本课的教案 及PPT,学习课文。
【单选题】Participating in the formation of the median sulcus of the forearm is ( )
【简答题】What's the significance of Puritanism in the formation of America?