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【单选题】
一个字节是由8个二进制位组成,它所能表示的最大的十六进制数为( )。
A.
255
B.
256
C.
8F
D.
FF
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【判断题】50%的甘油缓冲液常用来作为细菌病料的保存剂。 ( )
A.
正确
B.
错误
【判断题】过度焦虑使人不能准确观察现实,也就不能作出适当的判断与决定,从而导致适应和应对的失败,致使情绪反应接踵而来。
A.
正确
B.
错误
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C.
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A.
It looks attractive.
B.
It tastes delicious.
C.
It is not expensive.
D.
They want to imitate their heroes.
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