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【简答题】
A 5.0 MeV alpha particle (Z=2) approaches a gold nucleus (Z=79) with an impact parameter of 2.6×10-13 m. The scattered angle is( ).The cross section s is( )
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举一反三
【单选题】When John called for help, Ron appeared very __________.
A.
brave
B.
selfish
C.
generous
D.
foolish
【单选题】Mary, I________ John of his promise to help you.
A.
told
B.
reminded
C.
warned
D.
advised
【简答题】-john is very If he promise to do something he'll do it. A.independent B.reliable C.confident D.flexible
【单选题】Ron and John promised to __________ in any case of danger.
A.
run away
B.
stay still
C.
call the police
D.
help each other
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