主页
学科
搜索
账户
常见问题
当前学科:炼铁热风炉高级工
题目:
单选
热风炉燃烧期和送风期,其热交换主要在()中完成。
A . 蓄热室
B . 燃烧室
C . 拱顶
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:
某产妇26岁,在产程中出现协调性子宫收缩乏力,最恰当的处理措施是()。
精神疾病患者的护理道德要求是()
技术要求:松下TSK-1013电木圈所使用的电木粉型号为T375J﹔012碳刷座要求的是()。
该图为地震波在地壳内的传播速度图,回答问题。 古登堡界面的大致深度在()
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_________.
腔肠动物的生态特点是什么?
Parkinson病rCBF显像的特征性改变是()。
关于吉兰-巴雷综合征的诊断要点中不正确的是().
下列关于企业所得税所得来源的确定说法中正确的有( )。
在①旋风分离器②沉降室③袋滤器④静电除尘器等除尘设备中,能除去气体中颗粒的直径符合由大到小顺序的是()