单件生产时,应尽量利用现有的专用设备和工具。( )
参考答案:错
某市为改善越江交通状况,提出以下两个方案。
方案1:在原桥基础上加固、扩建。该方案预计投资40000万元,建成后可通行20年。这期间每年需维护费1000万元。每10年需进行一次大修,每次大修费用为3000万元,运营 20年后报废时没有残值。
方案2:拆除原桥,在原址建一座新桥。该方案预计投资120000万元,建成后可通行60年。这期间每年需维护费1500万元。每20年需进行一次大修,每次大修费用是5000万元,运营60年后报废时可回收残值5000万元。
不考虑两方案建设期的差异,基准收益率为6%。
主管部门聘请专家对该桥应具备的功能进行了深入分析,认为应从F1、F2、F3、F4、F5共五个方面对功能进行评价。表6-1是专家采用0-4评分法对5个功能进行评分的部分结果,表6-2是专家对两个方案的5个功能的评分结果。
[问题]
在表6-1中计算各功能的权重(权重计算结果保留三位小数)。
Drug use is rising dramatically among the nation’ s youth after a decade of decline. From 1993 to 1994, marijuana use among young people (1) from 12 to 17 jumped 50 percent. One in five high school seniors (2) marijuana daily. Monitoring the Future, which (3) student drug use annually, reports that negative attitudes about drugs have declined for the fourth year in a row. (4) young people see great risk in using drugs. Mood-altering pharmaceutical drugs are (5) new popularity among young people. Ritalin, (6) as a diet pill in the 1970s and now used to (7) hyperactive children, has become a (8) drug on college campuses. A central nervous system (9) , Ritalin can cause strokes, hypertension, and seizures. Rohypnol, produced in Europe as a (10) tranquilizer, lowers inhibitions and suppresses short-term memory, which has led to some women being raped by men they are going out with. (11) taken with alcohol, its effects are greatly (12) . Rock singer Kurt Cobain collapsed from an (13) of Rohypnol and champagne a month before he committed (14) in 1994. In Florida and Texas, Rohypnol has become widely abused among teens, who see the drug as a less expensive (15) for marijuana and LSD. Alcohol and tobacco use is increasing among teenagers, (16) younger adolescents. Each year, more than one million teens become regular smokers, (17) they cannot legally purchase tobacco. By 12th grade, one in three students smokes. In 1995, one in five 14-year-olds reported smoking regularly, a 33 percent jump (18) 1991. Drinking among 14-year-olds climbed 50 percent from 1992 to 1994,and all teens reported substantial increases in (19) drinking. In 1995, one in five 10th graders reported having been drunk in the past 30 days. Two-thirds of high school seniors say they know a (20) with a drinking problem.
1()
A.aged
B.aging
C.age
D.ages