主页
学科
搜索
账户
常见问题
当前学科：航线运输驾驶员执照ATPL考试
题目：
问答题
为了有资格参加实际测试重新获得二类飞行资格，飞行员需要什么样的仪表进近经历？
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:
箱体包装应完整、牢固，不应（）漏出卷烟条盒。
离子交换树脂的交联度对树脂性能有很大影响，交联度小，则（）
本质安全型电气设备的防爆性能是采用（）措施实现的。
由集成运放作为前置级的互补对称功放电路如下图所示，试：
经营整改期内服务有何变化？
船舶风动力转船力矩系数与风舷角有关，一般情况下：（）.
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_________．
急性胃炎的健康教育不包括（）。
股份有限公司的发起人具有下列（）义务。