主页
学科
搜索
账户
常见问题
当前学科：第十二章土木工程材料
题目：
填空题
砂的筛分析，用于测定（）、（）。
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:
邓小平正式提出“建设有中国特色的社会主义”科学命题是在（）
《大周刑统》
在商业广告的种类分别中，下列那种是按广告的诉求方式划分的（）.
自耦变压器的主要缺点是短路阻抗()
（）在少林寺，任我行一声长啸，将桌上多少支蜡烛都灭了？
电信通信服务障碍按发生原因分（）。
某手表厂为纪念千禧年特制纪念手表2000只，每只售价2万元。其广告主要内容为：（1）纪念表为金表；（2）纪念表镶有进口钻石。后经证实，该纪念表为镀金表；进口钻石为进口人造钻石，每粒价格为1元。手表成本约1000元。为此，购买者与该手表厂发生纠纷。该纠纷应如何处理？（ ）
四逆散的或然证有（）
下列不属于M1的是()
根据下列短文，回答题。 Despite the fact that today viruses(病毒)are known to cause cancer in animals and incertain plants，there exists a great reluctance to accept viruses as being of importance in humancancer．Basic biological phenomena generally do not differ strikingly as one goes from one spe—cies to another．It should be recognized that cancer is a biological problem and not a problemthat is unique for man．Cancer originates when a normal cell suddenly becomes a cancer cellwhich multiplies widely and without apparent restraint．Cancer may originate in many differentkinds of cell，but the cancer cell usually continues to carry certain traits(特性)of the cell of origin．The transformation of a normal cell into a cancer cell may have more than one kind of cause．but there is good reason to consider the relationships that exist between viruses and cancer． Since there is no evidence that human cancer，as generally experienced，is infections，manypersons believe that because viruses are infections agents they cannot possibly be of importancein human cancer．However，viruses can mutate(突变)and examples are known in which a vi．rus that never kills its host can mutate to form a new strain of virus that always kills its host．Itdoes not seem unreasonable to assume that an innocuous(无害的)latent(潜伏的)virus mightmutate to form a strain that causes cancer．Certainly the experimental evidence now available isconsistent with the idea that viruses as we know them today，could be the causative(引起……的)agents of most，if not all cancer。including cancer in mall．Cancer should be considered to be a biological problem rather than a medical one because_________．