主页
学科
搜索
账户
常见问题
当前学科：中小学科普知识
题目：
判断题
世界上最硬的物质是碳。（）
A . 正确
B . 错误
答案：
<查看本题扣1积分>
查看答案
答案不对？请尝试站内搜索
推荐知识点:
1996年，ISBT将红细胞表面抗原分的血型系统有（）
王老师为讲解二次函数的图像和性质，将文字、图像和动画等媒体用软件PowerPoint制作成课件。这种为表现某一主题将多种媒体有机组织在一起的形式，主要体现了多媒体的（）
未实行全市集中审计的邮政储蓄二级分行的网点审计负责人员，应对直辖网点每（）实施一次常规审计。
随着市场经济体制的逐步建立，以及我国人口、资源、环境和水土流失状况的变化，现行的《水土保持法》中许多规定已经不能满足新形势下水土保持事业发展的要求，需要及时修订。（）
中国发展不对任何国家构成威胁。中国无论发展到什么程度，永远不称霸，永远不搞扩张。()
某患者，40岁，结肠癌，择期行手术治疗，下列做法中不妥的是（）。
普通实验室内，不得私自饲养实验动物。
Bribery may lead to murder. A month ago reporters rushed to the(1)of a crime. At the spot the detective seemed even hardly aware of their(2)as he did his work. He carefully searched for(3)over every inch of the house. After a while, he bent over to pick up a small torn(4)of fabric. Nothing could(5)from his search. The detective(6)that this piece of fabric was(7)from the murderer's clothing during a struggle. The(8)had been the finance director of a very large computer hardware manufacturer. His wife, a timid woman,(9)everything she knew with the detective, including a hot(10)her husband had with some of the company's top executives at a banquet. There had been a scandal(11)bribery at his company. He was(12)the business of many of the top executives. He had(13)that some people were giving special favors to government officials to get(14). He often questioned their moral(15)and told them that he would accuse them if they were doing something they shouldn't,(16)caused problems for him. His questioning and accusing often left him at(17)with many of the executives. This time it had led to a(18)blow on his head. The detective caught(19)of a crucial clue, a brass button in the corner. It was from a jacket of one of the top executives. Later this executive and the company's president was(20). Of course this is not the end of the story.
以下属于神经递质的是（）
触电的可能形式有单相触电、两相触电和( )。