8 | 16 | 19 | 22 |
16 | 16 | 22 | 24 |
19 | 22 | 26 | 27 |
22 | 22 | 26 | 27 |
267.5 | -63.4 | 41.8 | -2.7 |
-6.3 | -31.3 | 1.8 | 4.2 |
-10.7 | 8.6 | -1.2 | 2.3 |
3.8 | -8.9 | -4.7 | 1.4 |
At the present time, 98 percent of the
world energy consumption comes from stored sources, such as fossil fuels or
nuclear fuel. Only hydroelectric and wood energy represent completely renewable
sources on ordinary time scales. Discovery of large additional fossil fuel
reserves, solution of the nuclear safety and waste disposal problems, or the
development of controlled thermonuclear fusion will provide only a short-term
solution to the world’s energy crisis. Within about 100 years, the thermal
pollution resulting from our increased energy consumption will make solar energy
a necessity at any cost. Man’s energy consumption is currently about one part in ten thousand that of the energy we receive from the sun. However, it is growing at a 5 percent rate, of which about 2 percent represents a population growth and 3 percent a per capita energy increase. If A. preempt and refute a possible objection to the author’s position B. support directly the central thesis of the passage C. minimize the significance of a contradiction in the passage D. prove that such measures are ineffective and counterproductive [单选题]进程和程序的本质区别是( )。
A.存储在内存和外存 B.顺序和非顺序执行机器指令 C.分时使用和独占使用计算机资源 D.动态和静态特征 [单项选择]麻疹的传染源是
A. 带菌者 B. 患者 C. 家禽 D. 家畜 E. 水源 [多选题]长期消防工作实践表明,消防工作具有( )等特点。
A.社会性 B.行政性 C.经常性 D.技术性 [多选题] 设备双重名称即设备( )。
A.名称 B.状态 C.称号 D.编号 [判断题]对于调频信号,也可以用其上边带或下边带传输信息。
A.正确 B.错误 [简答题]国有资产收益分配的原则是什么?
[判断题][渤海银行] 构成投资组合的证券A和证券B,其标准差分别为12%和8%。在等比例投资的情况下,如果两种证券的相关系数为1,该组合的标准差为10%;如果两种证券的相关系数为-1,则该组合的标准差为2%。( )
[单选题]关于暴发,哪种说法是错误的
A.暴发时病例发病日期不同是由于该病的传染期不同所致 B.暴发有集中同时的暴发,也有持续、蔓延的暴发 C.暴发的疾病可以是传染病,也可以是非传染病 D.暴发常由于许多人接触同一致病因子而引起 E.在特定人群短时间内发生多例同一种疾病叫暴发 [简答题]《铁路机车回送管理办法》规定:机车按有动力附挂方式回送时,附挂运行中,附挂回送机车( )投入运用。
[填空题]Access是______办公套件中的一个重要组成部分。
我来回答: 提交
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