主页
学科
搜索
账户
常见问题
当前学科：连铸初级工
题目：
问答题
简述火焰切割的原理。
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:
白衣服放久了，变黄怎么办？
焦炉的地下室、烟道通廓煤气设备多，阀门启闭频繁，极易泄漏煤气。必须对煤气设备定期进行检查，及时维护，烟道通廓的贫煤气阀应保证其处于()状态。A.负压B.正压C.标准压力
小纱疵的分级中，包含下列的（）.
荔枝核的功效是（）
某县为了考核新生儿乙肝疫苗的全程接种率，采用系统抽样方法对1999年1月份以后出生的新生儿进行调查，以事先随机决定的抽样号码，按预防接种登记册，每隔10人中抽取1人，在2100名新生儿中抽取210名，胎程（0、1、6月）接种率为59%。全县新生儿全程免疫接种率的95%可信限为（）
Promising Results from Cancer Study A new experimental vaccine(疫苗)has shown promising results in the fight against lung cancer．In a small Texas-based study，a vaccine developed by scientists at Baylor University Medical Centre in Dallas，USA，cured lung cancer in some patients and slowed the progress of the disease in others． Researchers have reported encouraging findings from this small study．Forty-three patients suffering from lung cancer were involved in these trials．Ten of these patients were in the early stages and thirty—three in the advanced stages of the disease．They were injected with me Vaccine every two weeks for three months，and were carefully monitored for three years.In three of the patients in me advanced stages of cancer，the disease disappeared and in the others，it did not spread for five to twenty—four months．However，no great difference was seen in the patients in the early stages of the illness． This new vaccine uses the patients’own immune、system．It is made specifically for each patient and is injected into the arm or leg．It stimulates the body’s immune system，which then recognizes that the cancer cells are harmful，and attacks and destroys them. The vaccine could be effective against other forms of cancer．It offers great hope for the treatment of cancer in general，although further studies are needed before such treatment can be widely used．根据以上内容，回答题。The vaccine cured all the participants in the trial．
学习策略可以从以下哪几个方面进行描述?()
每笔原始交易只能进行（）贷记调整且贷记调整金额必须（）原始交易金额。
一般情况下，公司的技术性图纸只要老板签名就可以使用了。
要改变锻件内纤维组织的形状和方向，可采用的方法是()。