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问题 填空题

钢材的锈蚀程度主要通过对钢材锈蚀面积大小、锈蚀物的性状、色泽以及锈蚀深度等来判定。其中（）的锈层面凸起或呈片状，一般为暗褐色或红黄色，除锈后表面呈麻坑状。

答案

参考答案：重锈

填空题

用化学用语填空： 

（1）氟元素              ；       （2）2个氢氧根离子              ；

（3）4个五氧化二磷分子      ；    （4）硝酸银中氮元素的化合价          ；

（5）写出一个既能表示一种元素，又能表示一个原子，还能表示一种物质的化学用语：                                                           。
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单项选择题

A recent spate of art thefts at a major museum has led to a drastic increase in the insurance premiums that the museum must pay to insure its collection. Many art fans are concerned that the museum, which traditionally has charged no entrance fee, will be forced to charge a high entrance fee in order to pay for the increased insurance premiums.
Which of the following, if true, would most alleviate the concern of the art fans that the museum will be forced to charge high entrance fees ？（）

A. Law enforcement officials recently apprehended the Belgian Bobcat, a notorious art thief who has been linked to at least 20 art heists.

B. Citing a dispute with the insurance company over the terms of its coverage, the museum has chosen to cancel its insurance policy.

C. The majority of visitors to the museum are schoolchildren, who could not reasonably be expected to pay a high entrance fee.

D. The museum pays for the majority of its total expenses from its large endowment, which is earmarked specifically for purchasing new art.

E. The museum recently installed a state-of- the-art burglar alarm system that will make future thefts almost impossible.
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