多项选择题

PET显像常用的放射性核素是（）

A．11C
B．13N
C．15O
D．18F

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单项选择题

In British society, what is the dominant principle that the queue is symbolic of?

A.Politeness
B.Modesty
C.Fair
B.Order

单项选择题

Which of the following statements is NOT true about the word ‘typical’?

A.It
B.
B.It
C.
C.It
D.
D.It