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问题 单项选择题

当出现索赔事项时，承包人以书面的索赔通知书形式，必须在索赔事项发生后的（）以内向工程师正式提出索赔意向通知。

A．28天

B．10天

C．15天

D．18天

答案

参考答案：A

填空题

紫薯营养 丰富，具有特殊的保健功能。紫薯中富含淀粉、蛋白质、维生素A、维生素B、维生素C、锌、铁、钙、硒等。

(1)紫薯中维生素_____________(选填“A”、“B”或“C")可预防坏血病；

(2)紫薯中还缺乏一种能给人体供能的营养素是______________________；

(3)紫薯中的硒元素被誉为“抗癌大王”。硒元素的部分信息如下图，则下列说法中正确的是____________；

A．硒元素的相对原子质量为78.96g   

B．一个硒原子中有34个中子

C．硒原子结构示意图中的X=18  

D．硒元素在化合物中可能显一2价

(4)紫薯种植常需施用复合肥。现有硝酸铵、硝酸钾、氯化钾、氯化铵、碳酸钾几种化肥，其中属于复合肥的是________________。
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单项选择题

(56) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(57) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(58) is an approach preferred by cable TV providers. In this solution the fiber terminates at an opto-electrical converter and the final segment is a shared coaxial cable.
(59) is a device used to connect two separate network that use different communication protocol.
(60) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

A．MD

B．RSA

C．DES

D．MIB
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