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【单选题】
实验中,水杨酸的最大吸收波长为?A.
380nm
B.
277nm
C.
300nm
D.
200nm
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举一反三
【单选题】----- Our holiday cost a lot of money. ----- Did it? Well, that doesn’t matter ________ you enjoyed yourselves.
A.
unless
B.
as soon as
C.
as long as
D.
though
【单选题】You don't look _______. What's the _______ you? [ ]
A.
good, wrong to
B.
well, matter with
C.
fine, happened to
D.
healthy, up with
【单选题】．—What’s the matter with the man hanging his head there? —Well, if you _______ know, he was caught stealing my bike.
A.
must
B.
may
C.
can
D.
shall
【单选题】No matter _____ you do, you must do it as well as possible. [ ]
A.
what
B.
how
C.
when
D.
where
【简答题】如果购买时选择的物流方式为快递、EMS、不需要物流,自“卖家已发货”状态起的(____天)后,系统会自动确认收货。
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