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【单选题】
设有两个事务 T1、T2，其并发操作如下图所示，下面说法正确的是【图片】A.
该操作不存在问题
B.
该操作丢失修改
C.
该操作不能重复读
D.
该操作读 “ 脏 ” 数据
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【单选题】Why is it easy for people to work in other member counties when the Euro became the single currency?
A.
Because people are more easily employable in other countries.
B.
Because the salary can be paid in the same currency.
C.
Because the same business is conducted in other countries.
D.
Because different countries adopt the same employment policy.
【单选题】Not a single word ______ when ______ about his family and his experiences in the beginning. [ ]
A.
the young man said, asked
B.
did the young man say, asked
C.
the young man said, asking
D.
did the young man say, to ask
【单选题】It is possible to form. a single and legitimate world government only when______.
A.
people of different nations hold similar political views
B.
human beings as a whole have one common enemy
C.
people are willing to abandon their 'national character'
D.
human beings are able to contact beings in outer space
【单选题】When drawing a single gear, the deddendum circle is represented by (Single option: 10 points)
A.
Thin solid line
B.
Thick solid line
C.
ot-dash line
D.
None
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