队列研究比病例对照研究优越的表现在于（） A.无需对照 B.样本较小 C.所得结论比

当公共权力被滥用，当政府官员不尽职，造成国家和集体的利益受到损害、人民群众的权益受到威胁时，公民，请举起手中的利剑，依法同腐败分子作斗争。作为一个公民，在举起手中的利剑时                       (　　)

①遵守宪法和法律

②要有敢于同邪恶势力进行斗争的勇气

③不得捏造或者歪曲事实，应该实事求是

④要有序参与政治

A．①②③

B．②③④

C．①③④

D．①②③④

下列排列顺序不正确的是[ ]

A．热稳定性：HF＞HCl＞HBr

B．原子半径：Na＞S＞O

C．酸性：H₃PO₄＞H₂SO₄＞HClO₄

D．元素金属性：Na＞Mg＞Al

每一位记者登录系统后，只能看到（）发布的图片。

A.任何人

B.自己

C.第三方

D.访问者

7/2.2钢绞线的外径为（）mm。

A.6.0

B.6.6

C.7.8

D.9.0

System analysis is traditionally done top-down using structured analysis based on (90) ．Object-oriented analysis focuses on creation of models．The three types of the analysis model are (91) ．There are two substages of object-oriented analysis． (92) focuses on real-world things whose semantics the application captures．The object constructed in the requirement analysis shows the (93) of the real-world system and organizes it into workable pieces． (94) addresses the computer aspects ofthe application that are visible to users．The objects are those which can be expected to vary from time to time quite rapidly．

A．Program analysis
B．Function requirement
C．Application analysis
D．Physical model