【判断题】基团O=C一H的v(C一H)出现在2720cm-1( )
【单选题】Directions: This section is totest your ability to understand short conversations. There are 2 recordedconversations in it. After each conversation, there are some recordedquestions. Both the conversa...
【单选题】Directions: In this section,you will hear three news reports. At the end of each news report,you will hear two or three questions. Both the news report and the questions will be spoken only once.After...
A.
1. A) There are some coffee drinkers around the world.
B.
B) Drinking coffee helps people live longer.
C.
C) People have different coffee drinking habits.
D.
D) Coffee can protect against all diseases.
【单选题】有关冲动型人格障碍的描述,不正确的是
A.
情绪不稳,易与他人发生争执和冲突,冲动后对自己的行为毫无悔意
B.
做事往往事先没有计划或不能预见可能发生什么事情
C.
情感暴发时,对他人可有暴力攻击,对自己可有自杀、自伤行为
【判断题】基团O=C-H的v(C-H)出现在2720cm-1。( )
【简答题】某厂利用一种天然产物进行发酵,发现发酵液中含有U、V、W、X等多种化合物。已知①U和W均可与银氨溶液反应,析出金属银,而且U是一种单糖。②V是单官能团化合物,其碳原子数和X相同。V在浓硫酸作用下经加热得Y,Y可以使溴水褪色。③V经催化氧化可生成W。④V和X在少量浓硫酸作用下经加热可以得到Z。⑤X的组成为C∶40%;H∶6.7%;O∶53.3%。X含有一个羧基,450mgX与0.20mol/L的Na...
【判断题】基团O-C--H 的v(C H) 出现在2720cm
【单选题】Part II (3*10=30%) Directions: In this section, you will hear 3 short passages. Each passage will be spoken TWICE. At the end of each passage, there will be a pause. During the pause you must read the...
D.
near a railway station
【单选题】关于引导线的说法,不正确的是( )
C.
引导层中存放运动路径,被引导层中存放运动对象