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【單選題】

下列實(shí)驗(yàn)操作或事故處理正確的是

A.
實(shí)驗(yàn)結(jié)束后,用嘴吹滅酒精燈
B.
把水加入到濃硫酸中來(lái)配置稀硫酸
C.
金屬Na著火,立即用水撲滅
D.
實(shí)驗(yàn)桌上的酒精燈傾倒了燃燒起來(lái),馬上用濕布撲滅
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參考答案:
舉一反三
【單選題】From the passage, we can learn ________.
A.
one must judge himself before he judges others
B.
one should often make his windows clean
C.
one shouldn't criticize others very often
D.
one must look at others through his dirty windows
【單選題】It’s clear that ________.
A.
they both worked as cleaners
B.
the writer often washed the window
C.
the writer had never met the woman before
D.
they lived in a small town
【單選題】Why was Lisa chosen to play the role of the queen in the play?
A.
Because she was a star.
B.
Because she was fat.
C.
Because she was liked by her classmates.
D.
Because she was the best student in her class.
【單選題】Which of the following is TRUE about the school clubs?
A.
There are fewer students from higher grades in the school clubs.
B.
The school clubs in high school only welcome sports fans.
C.
Summer activities begin before school starts.
D.
The school office can help new students join school clubs.
相關(guān)題目:
【單選題】From the passage, we can learn ________.
A.
one must judge himself before he judges others
B.
one should often make his windows clean
C.
one shouldn't criticize others very often
D.
one must look at others through his dirty windows
【單選題】It’s clear that ________.
A.
they both worked as cleaners
B.
the writer often washed the window
C.
the writer had never met the woman before
D.
they lived in a small town
【單選題】Why was Lisa chosen to play the role of the queen in the play?
A.
Because she was a star.
B.
Because she was fat.
C.
Because she was liked by her classmates.
D.
Because she was the best student in her class.
【單選題】Which of the following is TRUE about the school clubs?
A.
There are fewer students from higher grades in the school clubs.
B.
The school clubs in high school only welcome sports fans.
C.
Summer activities begin before school starts.
D.
The school office can help new students join school clubs.
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