木块下面悬挂一块金属块，木块仍浮在水面，下面哪种说法正确：A、木块的重力等于木块的浮力;B、金属块的重力等于它的浮力;C、金属块和木块的重力
[s1] 运用化学反应原理研究常见元素的单质及其化合物有重要意义。（1）合成氨反应N2 (g)+3H2(g) 2NH3(g)，△H＜0。若在恒温、恒压条件下向平衡体系中
----What are we going to do on Sunday? -----How about _ ? A. to go hiking B. going to hike C. go hiking D. going hiking
You have every right to accuse him of staining your reputation only if the problem does not _______ you. A. focus on B. admit of C. belong to
6．下列有关中国古代文化常识的表述不正确的一项是（ ） A．中国古代从汉武帝时开始使用年号纪年，第一个年号为建元。在中国历史上，清代康
下列关于甲、乙、丙、丁四个图像的说法中，正确的是A．图甲表示向盐酸溶液中通入NH3过程中溶液导电性的变化 B．由图乙可知，若除去CuSO4溶液中的Fe3
Many students may feel stressed because of their parents. Most parents have good intentions, but some of them aren’t very 61 (help) with the problems their sons and daughters have in 6
假如你是李明，你发现部分同学每次遇到重要考试，都会出现一些焦虑症状。请你用英语写一封信，向某学生英文报编辑反映该问题。信的内容应
B. 
D. 
，故选C