当充入舱内的惰气含氧量超过（）时，应立即停止原油洗舱。 A.5％ B.6％ C.7％

Biometric access-control systems—those using fingerprints, voiceprints, etc., to regulate admittance to restricted areas—work by degrees of similarity, not by identity. After all, even the same finger will rarely leave exactly identical prints. Such systems can be adjusted to minimize refuels of access to legitimate access-seekers. Such adjustments, however, increase the likelihood of admitting impostors.
Which of the following conclusions is most ply supported by the information above

A．If a biometric access-control system were made to work by identity, it would not produce any correct admittance decisions.

B．If a biometric access-control system reliably prevents impostors from being admitted, it will sometimes turn away legitimate access-seekers.

C．Biometric access-control systems are appropriate only in situations in which admittance of impostors is less of a problem than is mistaken refusal of access.

D．Nonbiometric access-control systems—based, for example, on numerical codes—are less likely than biometric ones to admit impostors.

E．(E) Anyone choosing an access-control system should base the choice solely on the ratio of false refuels to false admittances.

分子动理论较好地解释了物质的宏观热学性质．据此可判断下列说法中错误的是[ ]

A．显微镜下观察到墨水中的小炭粒在不停地做无规则运动，这反映了液体分子运动的无规则性  

B．分子间的相互作用力随着分子间距离的增大，一定先减小后增大  

C．分子势能随着分子间距离的增大，可能先减小后增大  

D．在真空、高温条件下，可以利用分子扩散向半导体材料掺入其他元素

全国胜利并解决了土地向题以后，新民主主义社会的基本矛盾是（）

A.新中国同帝国主义的矛盾

B.工人阶级和资产阶级的矛盾

C.封建主义和人民大众的矛盾

D.中国人民同国民党残余势力的矛盾

要在命令行上以后台方式启动进程，需要在执行的命令后添加（）符号。

46～50题基于以下题干：
三名女士——R、S和T，两名男士——U和V以及4个孩子——W、X、Y和Z参加一个游戏。该游戏中共有9个席位，且这9个席位处于游戏场的3个不同的区域，每个区域中有3个相邻的席位。在游戏中这9个人必须根据以下条件分成3组：
(1)相同性别的成年人不能在同一组中；
(2)W和只不能在同一组中；
(3)X必须与S，或与U，或与S和U在同一组中。

下面哪一项一定正确

A．有一组的成员是由一名成年女性和两名小孩构成的。

B．有一组的成员是由两名成年男性和W构成的。

C．只和一名成年男性在一组。

D．T所在的组恰好包括了一个小孩。