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【判断题】
如果分组数列各标志位出现次数(f)相同,计算平均差的加权平均式等于简单平均。A.
正确
B.
错误
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举一反三
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【单选题】When I handed the report to John，he said that George was the person ________.
A.
to send
B.
for sending it
C.
to send it to
D.
for sending it to
【单选题】The Rough Guide to Nepal is a guide to the region.
A.
comprehensive
B.
comprehension
C.
superficial
D.
massive
【单选题】The Rough Guide to Nepal is a ________guide to the region.
A.
complex
B.
comprehensive
C.
deep
D.
extensive
【简答题】When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can m keep your space-probes sterile (无菌的). NASA, America's space agency, certainly does s...
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