A、B、C三种短周期元素在元素周期表中的相对位置如图所示,已知A、C可分别与B形

题型:选择题

问题:

A、B、C三种短周期元素在元素周期表中的相对位置如图所示,已知A、C可分别与B形成化合物X和Y,A与B的质子数之和为C的质子数,现有以下说法,其中判断正确的组合是( )

①B与C均存在同素异形体;②X的种类比Y的多③沸点:A的氢化物小于C的氢化物;④C的最高价氧化物对应水化物能与A的氢化物形成三种盐

A.①②③④        B.②③       C.①②④       D.①④

考点:构成物质的粒子—分子、原子、离子元素周期律
题型:选择题

下面短文的画线部分是错误的,请改正,并将其正确答案写在短文后面相应题号后的横线上。

  John was a rich 1.America man. One day he went into a shop when he was

spending his holiday in London. He wanted very much to buy a nice-looking

watch, but the owner of the shop asked five hundred dollars for it. Suddenly a

young man came into the shop, took the watch out of the 2. owner hands and ran

out with it. It all happened in a few seconds. When the owner ran out into the

street, the young man was already 3. losing among the people. John went on. At

the next corner, he saw the young man with the robbed watch in his hand.“Do you

want to buy a fine watch, sir?” he asked in a low voice. “It’s only a hundred

dollars.” “The young man doesn’t know I saw him 4.robbed the watch,” he

thought. John paid for the watch at once and went back to his hotel with the

watch. He told his friend Bill about the fine watch. Bill took a look at the watch

and started laughing. He said, “You are a fool. This watch isn’t worth even ten

dollars. I’m sure the shop owner and the young man 5.planed this together.”

1.________ 2.________ 3.________ 4.________ 5.________

题型:选择题

下列关于“三同时”论述错误的是()

A.是对新建、扩建、改建企业项目进行的卫生监督要求

B.是指劳动卫生设施与主体工程同时设计、同时施工、同时投产

C.是预防性卫生监督内容

D.目的在于保证投产后劳动环境符合卫生标准要求

E.具有法律效力

题型:选择题

交付完毕

题型:选择题

下列关于接种单位的说法错误的是()

A.接种单位应具有经过县级人民政府卫生主管部门组织的预防接种专业培训并考核合格的执业医师、执业助理医师、护士或者乡村医生

B.接种单位应具有符合疫苗储存、运输管理规范的冷藏设施、设备和冷藏保管制度

C.接种单位应当承担责任区域内的预防接种工作,并接受所在地的县级疾病预防控制机构的技术指导

D.接种单位应当根据预防接种工作的需要,制定第一类疫苗的需求计划和第二类疫苗的购买计划,并只需要向县级疾病预防控制机构报告

题型:选择题

2003年3月20日,美国不顾全世界大多数国家和人民爱好和平的愿望,发动了伊拉克战争,此行动过程违反了()。

A.《联合国 * * 》

B.《联合国打击中国有组织犯罪公约》

C.《联合国海洋法公约》

D.《反对劫持人质国际公约》

更多题库