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免疫染色系统包括:识别系统 —— 一抗(特异性抗体);联结系统 —— 二抗(联结抗体;显色系统 —— 三抗(酶标抗体) + 显色剂A.
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B.
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【单选题】Working hours in the United States ____________over the past 20 years.
A.
have increased
B.
increased
C.
were increasing
D.
have been increased
【简答题】Over the past 20 years, retail sales in China have increased nearly ______ every year, to some ＄628 billion in 2004— it the third-largest market on earth.
【单选题】In my opinion standards of workmanship have ______ over the past 20 years.
A.
aggravated
B.
diminished
C.
deteriorated
D.
eroded
【单选题】Over (the past) 20 years, the Internet has (helped change) our world in (either) way or another (for the better).
A.
the past
B.
as well as
C.
to dinner
D.
neither of
【简答题】Over the past 20 years, the Internet helped change our world in _____way or another for the better. A．any B．one C．every D．either
【单选题】Over the past 20 years, the Internet helped change our world in _____way or another for the better.
A.
any
B.
one
C.
every
D.
either
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