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【多选题】
According to the statistics, every year many business people, doctors, or lawyers their jobs to start businesses of their own.A.
quit
B.
give up
C.
get
D.
start
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【简答题】设A，B为两个事件，且已知概率P(A)＞0，P(B)＞0，若事件A，B互斥．则下列等式中( )恒成立． (a)P(A+B)=P(A)+P(B) (b)P(A+B)=P(A)P(B) (c)P(AB)=P(A)+_P(B) (d)P(AB)=P(A)P(B)
【简答题】晶体的电光效应指的是( )。
【单选题】晶体的电光效应指的是（ ）。
A.
某些晶体在外加电场的作用下，其折射率随外加电场的变化而变化的现象。
B.
某些晶体在外加电场的作用下，吸收系数随外加电场的变化而变化的现象。
C.
某些晶体在外加电场的作用下，反射率随外加电场的变化而变化的现象。
D.
以上说法都不对。
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【简答题】Billy looks __________ because he doesn't have enough money to __________ .His mother has given him the money of this month, But he __________ . Jenny suggests that he should __________ for himself. F...
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