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Unit 3 视频1-4 What does Len have for breakfast?A.
milk
B.
fruit
C.
cereal
D.
coffee
E.
bacon and eggs
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举一反三
【简答题】straight adv.
【单选题】Great importance has been ________ education since 1985, when the first educational reform began. [ ]
A.
attached to
B.
devoted to
C.
linked to
D.
used to
【单选题】As welfare reform. has____millions of single mothers like Patino into the workforce since 1996, questions about its effects on families have loomed large.
A.
nudged
B.
propelled
C.
divested
D.
bumped
【简答题】粒子速率 v=______× 10 8 m/s 时,粒子的动量是非相对论动量的两倍。 ( 保留两位小数 )
【单选题】The army officer ________ his men to stand straight as the general turned up. [ ]
A.
requested
B.
advised
C.
begged
D.
commanded
【简答题】粒子速率 v=______× 10 8 m/s 时,粒子的动能等于它的静止能量。 ( 保留两位小数 )
【简答题】如图所示，真空室内存在宽度为s=8cm的匀强磁场区域，磁感应强度B=0．332T， 磁场方向垂直于纸面向里，紧挨边界ab放一点状α粒子放射源S，可沿纸面向各个方向放射速率相同的α粒子，α粒子质量为m=6.×10 -27 kg，电荷量为q=+3.2×10 -19 C，速率为V=3.2×10 6 m/s。磁场边界ab、cd足够长，cd为厚度不计的金箔，金箔右侧cd与MN之间有一宽度为L=12.8c...
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