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【单选题】
下表列出了前20号元素中的某些元素性质的有关数据 下列有关叙述正确的是 [     ]
A.
以上10种元素的原子中,失去核外第一个电子所需能量最少的是⑧
B.
由⑤、⑥、⑦三种元素中的某两种元素形成的化合物中,每个原子都满足最外层为8电子稳定结构的物质可能是PCl 5 和CCl 4
C.
某元素R的原子半径为1.02×10 -10 m,该元素在周期表中位于第三周期第ⅤA族
D.
若物质Na 2 R 3 是一种含有非极性共价键的离子化合物,则其化合物的电子式
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举一反三
【单选题】III子宫脱落是指
A.
子宫下降,宫颈外口距处女膜缘<4㎝< /div>
B.
宫颈外口已达处女膜缘
C.
宫颈脱出阴道口外,宫体在阴道内
D.
宫颈及部分宫体已脱出阴道口外
E.
宫颈与宫体全部脱出阴道口外
【单选题】The passage would most likely be found in a textbook on which of the following subjects?
A.
Astronomy.
B.
Botany.
C.
Geology.
D.
Chemistry.
【单选题】宫颈刮片细胞学检查为巴氏III级,确诊子宫颈癌的可靠方法是
A.
阴道镜检查
B.
腹腔镜检查
C.
宫颈和宫颈管活组织检查
D.
诊断性刮宫
E.
阴道脱落细胞学检查
【简答题】Like a scene out of a reality show or a Disney movie, Southgate, Mich., ager Ashley Qualls' moment has arrived. She may not have an MBA, a high-school diploma, or even a driver’s license yet, but ...
【简答题】(A类)如图1,在与旗杆AB相距20米的C处,用高1.20米的测角仪测得旗杆顶端B的仰角α=30度.求旗杆AB的高(精确到0.1米). (B类)如图2,在C处用高1.20米的测角仪测得塔AB顶端B的仰角α=30°,向塔的方向前进20米到E处,又测得塔顶端B的仰角β=45度.求塔AB的高. (精确到0.1米).我选做______类题,解答如下:
【单选题】The police came in __________ the thief attempted to rush out of the store.
A.
at the moment
B.
the moment
C.
for the moment
D.
at any moment
【单选题】Which of the following subjects was not included in those new courses of study?
A.
Theology.
B.
Physics.
C.
International law.
D.
Music.
【单选题】Which of the following subjects are NOT offered to elementary school students in the US?
A.
Mathematics and languages.
B.
Politics and business education.
C.
Science and social studies.
D.
Music and physical education.
【简答题】scale with which we are comparing our subjects provides an' effective' or' fair' comparison.
【单选题】Which of the following subjects are NOT mentioned as one that children study for experience?
A.
Drama.
B.
Social studies.
C.
Economy.
D.
Sociology.
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【单选题】III子宫脱落是指
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