设A、B相互独立，且P(A)＞0，P(B)＞0，则下列等式成立的是（）
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国内商品性会计软件报价一般应包含（）几部分。
A. 软件价格、售后服务与培训价格B-会计软件价格
B. 操作系统和会计软件价格
C. 操作系统和服务价格
A．thatB．itC．asD．what
A. that
B. it
C. as
D. what
Please point out()are the characteristics of settlement by letters of credit．
A. L／C is a self—sufficient instrument
B. L／C is a document transaction
C. L／C is not a self—suffeient instrument
D. L／C is a cargo transaction
A．ThoughB．ButC．AndD．However
A. Though
But
C. And
D. However
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