题目内容

A hierarchical
B linear
C treediagram
D vertical

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A the student
B liked
C anidea
D the linguistic lecture

A derivational morpheme
B free morpheme
C inflectional morpheme
D free form

A Black English is an ethnic variety of the English language.
B Black English is one of the official languages of America.
C Black English has some vocabulary of its own.
D Black English has a number of distinctive features in its phonological, morphological and syn-tactic systems.

设某企业仅产销一种产品，年产销量为80000件。该产品单位售价50元，单位变动成本30元，年固定成本600000元。该企业现拟购置一台专用设备，价值1200000元。预计可使用5年，预计残值200000元，按直线法计提折旧。该设备投入使用后，可使单位产品生产的变动成本下降40%。要求：分析该企业是否应购置该项设备。