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问题 单项选择题

肿瘤内既有牙源性钙化囊肿的特征，包括多少不等的影细胞，又有恶性细胞特点和浸润性生长

A．牙源性钙化囊肿囊性型
B．角化成釉细胞瘤
C．牙源性钙化上皮瘤
D．牙源性影细胞瘤
E．牙源性影细胞癌

答案

参考答案：E

单项选择题

The owner (buyer)of a project usually has the right to direct changes to the scope of work while the project work is being accomplished. Often, the owner will orally request a change and insist that the change be initiated immediately without the normal documentation (e. g. a change order). When the change is initiated without documentation, ______ .

A) the owner assumes all responsibility for paying for the change although the owner may at a later not want the change
B) the owner assumes responsibility for one-half the cost of the change until the documentation is completed and all at the same time
C) the project manager assumes all risk for the change, if initiated, until the documentation is received
D) the project manager assumes only the risk of misinterpreting the owner’s oral change directive, while the owner assumes responsibility for paying for the request change
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填空题

一根弹簧，在弹性限度内，悬挂15N重物时，弹簧长度为0.16m；悬挂20N重物时，弹簧长度为0.18m，则弹簧的原长为（）m，劲度系数为（）N/m。
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