【单选题】在一定条件下,RO 3 n- 与氟气可发生如下反应:RO 3 n- + F 2 + 2OH - = RO 4 - + 2F - + H 2 O 从而可知在RO 3 n- 中,元素R的化合价是 [ ]
【单选题】我们共产党员,是近代历史上最先进的革命者,是改造社会、改造世界的现代担当者和( )。
【单选题】下列哪一项不是市场调查方案设计的特点()。
【单选题】Which of the following statements is true?
A.
The old man had nobody to talk to.
B.
The old man took the child away and then sent him back.
C.
The old man wouldn't change his way of life.
D.
What some people thought about was partly right.
【单选题】对初阶选手来说,选择印花与底色加起来不超过()颜色最保险。
【判断题】我们共产党员,是近代历史上最先进的革命者,是改造社会、改造世界的现代担当者和推动者。
【单选题】下列哪一项不是市场调查方案设计的特点( )。