【单选题】According to the passage some s or customers may be invited because ______.
A.
they are likely to be annoyed if they are not
B.
they may give valuable presents
C.
their presence could provide future benefits
D.
they may help with the expenses of the wedding
【简答题】党坚持( )与( )同时并举的方针,对于在深刻的社会变革中保持社会稳定具有十分重要的意义。
【单选题】According to the passage, which of the following is NOT true?
A.
Foreign students if they are permanent residents in the U. S. can receive government assistance.
B.
Foreign students with 1-20 visa cannot receive government assistance.
C.
More students can receive scholarships than other types of financial aid.
D.
Students in financial difficulty can receive assistance.
【单选题】温度一定时,在纯水中加入酸后,溶液的( )。
【简答题】某化学兴趣小组对教材中“测定空气里氧气含量”的实验(见图I)进行了大胆改进,设计图(Ⅱ)(选用容积为45mL的18×180mm的试管作反应容器)实验方案进行,收到了良好的效果。请你对比分析下面图I. 图Ⅱ实验,回答下列有关问题: (1)指出实验中A. B仪器的名称:A________. B_________。 (2)图I实验中发生反应的化学方程式为_______________。 (3)图Ⅱ实验的...
【单选题】( )是对制定法律方面的要求,是全面推进依法治国的首要前提。
【简答题】某化学兴趣小组对教材中“测定空气里氧气含量”的实验(见图I)进行了大胆改进,设计了如图Ⅱ(选用容积为35 mL的18×180 mm的试管作反应容器)所示的实验方案,收到了良好的效果。请你对比分析下面图I、图Ⅱ实验,回答下列有关问题: (1)写出图Ⅰ实验中反应的表达式 ,红磷燃烧现象 。 (2)图Ⅱ实验的操作步骤如下:①点燃酒精灯;②撤去酒精灯,待试管冷却后松开弹簧夹;③将少量红磷平装入试管中,将2...
【多选题】下列业务中,即是合理保证业务,也是基于责任方认定业务的是( )
【单选题】温度一定时,在纯水中加入酸后溶液的 c (H + ) ( ) 。
A.
c (H + ) · c (OH − ) 变大
B.
c (H + ) · c (OH − ) 变小
C.
c (H + ) · c (OH − ) 不变