爱因斯坦的广义相对论预言了黑洞。

题型:判断题

问题:

爱因斯坦的广义相对论预言了黑洞。

考点:物理学从爱因斯坦到霍金的宇宙从爱因斯坦到霍金的宇宙题库
题型:判断题

下列离子方程式与所述事实相符且正确的是(  )

A.向明矾[KAl(SO42]溶液中逐滴加入Ba(OH)2溶液至SO42-恰好沉淀完全:2Al3++3SO42-+3Ba2++6OH-=2Al(OH)3↓+3BaSO4

B.在强碱溶液中次氯酸钠与Fe(OH)3反应生成Na2FeO4:3ClO-+Fe(OH)3=FeO42-+3Cl-+H2O+H+

C.向NaAlO2溶液中通入过量CO2制Al(OH)3:2AlO2-+CO2+3H2O=2Al(OH)3↓+CO32-

D.向含有a mol FeBr2的溶液中,通入x mol Cl2.若x=a,则反应的离子方程式为:2Fe2++2Br-+2Cl2=Br2+2Fe3++4Cl-

题型:判断题

先通读下面的短文,然后根据短文内容和所给首字母,在空格内填入一个适当的单词,使短文意思完整。所填单词必须在答题卷上完整写出。(本大题共10空,每空0.5分,共5分)

DIY, which means Do It Yourself, is quite popular in the UK. Lots of stores and supermarkets sell DIY things. TV programs show people how to DIY.

English people like DIY. If there is anything that needs fixing (修理) around their homes, such as                       p 小题1:   the walls or putting in a new shower, they will do the jobs themselves. They share DIY                 e  小题2:   with their friends. More and more people are fond of DIY and have d 小题3: the joy of DIY. Sometimes people also DIY for saving money. At present, many people can’t a 小题4:   a big house. They are looking at how they can make their houses better without spending a lot of money. It is not surprising that DIY is so popular.

DIY can be difficult. There is a large market for DIY furniture (家具) which needs to be got together by people themselves w  小题5:   a few tools. However, people often find it not easy to build a piece of furniture because they can’t understand the instructions (指令). Sometimes the instructions are simple and clear, but the furniture小题6:   is difficult to build. DIY can also be dangerous if you are not careful enough. It is 小题7:   that in just one year over 230,000 people were hurt while doing DIY in the UK, including 41,000 who fell off ladders.

DIY can bring us a lot of f  小题8:   and can help us save some money, but it is not always as easy as it is小题9:   to be if we do something that is too hard. Maybe factories should make products that are easier and小题10:   for us to DIY.

题型:判断题

剧场观众厅内栏杆的设计要求,以下哪一条不妥?

A.栏杆高度不应遮挡视线

B.坐席地坪高于前面横走道0.6m时应设栏杆

C.坐席侧面紧邻有高差的纵走道或梯步时应设栏杆

D.楼座前排和楼层包厢栏杆应采取措施保证人身安全,实心部分不得低于0.4m

题型:判断题

经过孔子修订的鲁国编年史是()。

A.《尚书》

B.《逸周书》

C.《论语》

D.《春秋》

题型:判断题

阿司匹林用于心绞痛缓解期作用原理的是()

A.减慢心率、降低心肌收缩力、减少心肌耗氧量

B.通过抑制钙离子进入冠状、周围血管壁平滑肌细胞内而扩张冠脉及周围血管

C.抑制血小板聚集

D.改善心肌营养与代谢

E.扩张冠脉及外周血管,减轻心脏负担

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