采煤工作面的再生顶板一般需要（）的时间压实胶接而成。 A.2 B.1年零6个月 C.

向AgNO₃、Cu（NO₃）₂、Mg（NO₃）₂的混合物溶液中加入一些锌粉，完全反应后过滤．不可能存在的情况是（　　）

A．滤纸上有Ag，滤液中有Ag⁺、Cu²⁺、Zn²⁺、Mg²⁺

B．滤纸上有Ag、Cu，滤液中有Ag⁺、Zn²⁺、Mg²⁺

C．滤纸上有Ag、Cu、Zn，滤液中有Zn²⁺、Mg²⁺

D．滤纸上有Ag、Cu、Zn、Mg，滤液中有Zn²⁺

国家规定职工带薪休假，领导安排你做此事的调研工作，你如何开展

药材枸杞子含有的主要化学成分是（）

A.甜菜碱

B.齐墩果酸

C.马鞭草苷

D.吴萸烯

E.大黄素

煮沸消毒人工喂食用具时，应该煮沸15min。

Questions 9-13

·You will hear five different opinions about friendship.
·For questions 9-13, choose from the list A-F what friendships mean to them.
·Use the letters only once. There is one extra letter which you do not need to use.
A. A real friend can share your happiness, accept and forgive faults.
B. Sometimes your best friend is yourself.
C. Family is more important than friends in his mind.
D. Friendship is more important than love.
E. A friend is someone who can understand you.
F. His best friend is his wife, because she knows what kind of mood
he is in.

Questions 9-13

·You will hear five different opinions about friendship.
·For questions 9-13, choose from the list A-F what friendships mean to them.
·Use the letters only once. There is one extra letter which you do not need to use.
A. A real friend can share your happiness, accept and forgive faults.
B. Sometimes your best friend is yourself.
C. Family is more important than friends in his mind.
D. Friendship is more important than love.
E. A friend is someone who can understand you.
F. His best friend is his wife, because she knows what kind of mood
he is in.