试题与答案

在下列四个方程中,X1、X2、X3和X4各代表某种粒子,以下判断中正确的是( )

题型:选择题

题目:

在下列四个方程中,X1、X2、X3和X4各代表某种粒子,以下判断中正确的是(  )

+++3X1+X2+X3+X4

A.X1是α粒子

B.X2是质子

C.X3是中子

D.X4是电子

答案:

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Firefighter David Smith was called in after the 6-year-old’s teachers and mother had failed to get him down from the balcony. "He was asking for his mother, "Smith said. "He was crying, and wouldn’t let any of us get near him." After hearing a conversation between the boy’s mother and his teachers about his love of superheroes , Smith hurried home to get his Spiderman clothes.

"I told him 'Spiderman is here to save you. No one will hurt you now,’" Smith said. "Then I told him to walk slowly toward me. I was really nervous that he might fall if he got too excited and started running." Then the crying boy broke into a smile and walked into the fireman’s arms.

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