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【单选题】
下列化合物应该属于( )。A.
对映体
B.
非对映体
C.
同一化合物相同构象
D.
同一化合物不同构象
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【单选题】Valentine's Day is approaching. Time to make a checklist: Did you send a card? Did you make dinner reservations? If not, do you have a recipe picked out for a romantic home-cooked meal, and do you hav...
A.
Red roses prepared for your date on Valentine's Day is highly recommended.
B.
To celebrate your Valentine's Day, you need to buy a lot of things.
C.
Making dinner reservation and having your best clothes cleaned is a must for Valentine's Day.
D.
One essential Valentine's Day element is music.
【单选题】When did the writer recieve her first Valentine gift from his father?
A.
At the age of 1
B.
At the age of 6
C.
At the age of 10
【单选题】When was the day named after Valentine?
A.
More than 1700 years ago before Valentine's death
B.
More than 2000 years ago
C.
On February 24
D.
It is not mentioned in the passage.
【单选题】What did the emperor do when he found out Valentine’s act?
A.
He sent him to the war
B.
He killed him right away
C.
He put him in prison
D.
He made him a slave.
【多选题】在下面论述中,符合对称密钥体制的是( )
A.
对称密钥体制也叫单密钥体制
B.
加密所使用的密钥与解密所使用的密钥不相同
C.
加密所使用的密钥与解密所使用的密钥相同
D.
从其中一个密钥可推导出另一个密钥
E.
从其中一个密钥无法推导出另一个密钥
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