搜题请搜索小程序“爱下问搜题”
问题
填空题
乙炔发生器供乙炔前，必须先行排除其中的（）。
答案
参考答案：空气
选择题
在等差数列{a
n
}中，a
2
=8，a
5
=64，则公差d为（ ）
A．2
B．3
C．
56
3
D．8
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填空题
CONVERSATION 2 (Questions 5-8)
The reason the customer wants to give her daughter a history book: A
(5)
present.
The customer may want to buy a history book about a
(6)
period.
How much does the book cost
(7)
The daughter’s birthday is not
(8)
next month anyway.
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