患者男性，52岁。近2个月来时常刺激性咳嗽，无痰，近1周来咳嗽加重，咯血，低热及胸痛。有30余年吸烟史。胸片示右上肺可见3cmx4cm大小阴影。查体:T:36.2℃，P:75次／分，R:16次／分，BP:120／85mmHg。

提示:准备对患者行手术切除术。下列表明禁忌开胸的有

A:血气分析PaO10kPa(75mmHg) B:肾功能不全 C:胸片示右全肺不张 D:最大通气量为预计值的75% E:心电图示ST段及T波有改变 F:血气分析PaCO8kPa(60mmHg)

如缺失，余留牙正常口底至舌侧龈缘的距离为10mm。设计铸造支架义齿，采用RPI卡环组

基牙预备时应备出

A:近中支托凹、远中支托凹 B:近中支托凹、舌侧导平面 C:近中支托凹、远中导平面 D:近中支托凹、颊侧导平面 E:远中支托凹、远中导平面

如缺失，余留牙正常口底至舌侧龈缘的距离为10mm。设计铸造支架义齿，采用RPI卡环组

如果大连接体采用舌杆，间接固位体可选

A:舌支托 B:切支托 C:附加卡环 D:前牙舌隆突上的连续卡环 E:以上均可

Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death.
Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised.
First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent .
Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth.

A:75 B:23 C:30 D:3000

气门座的锥角由15。、45。（或30。）和75。锥角三部分组成，其中（）的锥面与气门密封锥面贴合。

A:15. B:45.或30. C:75。

某厂新建#1机组在2007年全年发生第一类非计划停运3次，累计75小时；第二类非计划停运1次，累计10小时；第四类非计划停运1次，30小时。该机组全年强迫停运小时是（）小时。

A:85 B:115 C:30 D:75

闭路电视监控系统监控室内的温度宜为16℃～30℃，相对湿度宜为( )。

A:25%～75% B:20%～75% C:30%～80% D:30%～75%

现场配电系统第三级漏电保护器的额定漏电动作电流小于等于( )mA．。
A．15 B．30
C．75 D．100

A:15 B:配 C:30 D:75 E:100

（），75，30，150，170，300，460，600

A:25 B:-30 C:-35 D:40