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【简答题】
尿素加热并超过熔点时能发生缩合反应生成，其在碱性条件下加入少量硫酸铜溶液，即呈现色，这一反应称为反应，凡分子中含有两个或两个以上键的化合物都可以发生此反应。
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举一反三
【简答题】肺主治节功能包括,治理调节 、 调节 、促进 、 四点。
【单选题】Where did the old man take Pat?
A.
The Sun Hotel.
B.
A supermarket.
C.
The old man's house.
【单选题】In the fifth shop, he placed the chair gently on the floor because______.
A.
he wanted to hide the fact that the chair was broken
B.
the chair had a broken leg
C.
the chair was very valuable
D.
he thought of a plan to have the chair repaired
【单选题】The man is teaching in our school, but，believe it or not，he __ as a business man for 8 years.
A.
worked
B.
was working
C.
had worked
D.
has been working
【简答题】材料 某高中教师孙老师在谈到数学教学经验时指出：第一，通过各种方法，如开展问题研究、练习写论文等方法培养学生的学习能力，发展和完善智力素质。第二，重视基本知识的传授，加强基本概念的教学和基本技能的训练。同时，通过灵活多样的例子加深学生对基本原理的理解。第三，从数学学科特点出发，孙老师在学习上指导学生注意追根究底，寻找知识之间的联系和规律，培养学生的概括能力。第四，鼓励学生采用发现、探究的方法，寻找...
【单选题】Who was involved into the possible business according to the strange man?
A.
A Bohemian business man
B.
German rich man
C.
A royal family
【单选题】With his work completed,the business man stepped back to his seat,feeling pleased he was a man of action.
A.
which
B.
that
C.
what
D.
whether
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