更多“精馏塔分为精馏段和提馏段。”相关的问题
荚膜肿胀试验可以快速鉴定的细菌是 ( )A、流感嗜血杆菌B、肺炎链球菌C、脑膜炎奈瑟菌D、淋病奈瑟
荚膜肿胀试验可以快速鉴定的细菌是 ( ) A、流感嗜血杆菌 B、肺炎链球菌 C、脑膜炎奈瑟菌 D、淋病奈瑟菌 E、卡他布兰汉菌
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He avoided ______ my questions.
A.to answer
B.answer
C.being answered
D.answering
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A . 羟醛缩合反应B . 迈克尔加成反应C . 达村斯反应D . 曼尼希反应
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选出句子中加粗字体的正确含义。市∶能谤讥于市朝,闻寡人之耳者,受下赏。()
选出句子中加粗字体的正确含义。市∶能谤讥于市朝,闻寡人之耳者,受下赏。()
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关于水泥胶砂试件养护描述正确的是()。
A.养护池水的温度应在20℃±1℃
B.养护池温度每天至少记录一次
C.试验室温、湿度每天至少记录一次
D.养护箱或雾室的湿度至少每天记录一次
E.养护箱或雾室的温度至少每天记录一次
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企业交纳的下列税款,不需要通过“应交税费”科目核算的是( )。
A .
A.增值税
B . B.印花税C . C.土地增值税D . D.资源税
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CFCA成立于()。
A.2000年6月29日B.2000年5月29日C.2000年4月29日
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计算机安全主要包括()。A.实体安全B.软件安全C.数据安全D.其他答案都对
计算机安全主要包括()。 A.实体安全 B.软件安全 C.数据安全 D.其他答案都对
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第722题:砖砌体工程中可设置脚手眼的墙体或部位是()。
A:120mm厚墙
B:砌体门窗洞口两侧450mm处
C:独立柱
D:宽度为800mm的窗间墙
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酶是生命活动中不可缺少的生物催化剂。DNA酶、限制酶、蛋白酶可分别作用于( )。
A.DNA、质粒、胰岛素
B.RNA、DNA、生长激素
C.质粒、RNA、雄性激素
D.DNA、RNA、生长素
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在变电所电器部分,下列的()工作可以不用操作票。
A . A、拉和断路器的单一操作
B . B、事故处理
C . C、变压器的运行转检修操作
D . D、拉开接地隔离开关或撤出全所仅有的一组接地线
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自负心理就是盲目自大,过高地估计个人的能力,失去自知之明。()
A . 正确
B . 错误
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石材幕墙所用石材的弯曲强度不应小于()MPa。
A.4; B.6; C.8; D.10。
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Why do men die earlier than women The latest research makes it known that the reason could be that men’s hearts go into rapid decline when they reach middle age. The largest study of the effects of aging on the heart has found that women’s longevity may be linked to the fact that their hearts do not lose their pumping power with age. "We have found that the power of the male heart falls by 20—25 percent between 18 and 70 years of age," said the head of the study, David Goldspink of Liverpool John Moores University in the UK. "Within the heart there are millions of cells that enable it to beat. Between the age of 20 and 70, one-third of those cells die and are not replaced in men," said Goldspink. "This is part of the aging process." What surprises scientists is that the female heart sees very little loss of these cells. A healthy 70-year-old woman’s heart could perform almost as well as a 20-year-old one’s. "This gender difference might just explain why women live longer than men," said Goldspink. They studied more than 250 healthy men and women between the ages of 18 and 80, focusing on healthy persons to remove the confusing influence of disease. "The team has yet to find why aging takes a greater loss on the male heart," said Goldspink. The good news is that men can improve the health of their heart with regular exercise. Goldspink stressed that women also need regular exercise to prevent their leg muscles becoming smaller and weaker as they age.
A.healthB.long lifeC.agingD.effect
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文物拍卖标的报审材料应当由()共同签署标的征集鉴定意见。
A.企业相关负责人
B.全体拍卖师
C.文物拍卖专业人员
D.企业文物鉴定专家组
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