The growth of population during the
past few centuries is no proof that population will continue to grow straight
upward toward infinity and doom. On the contrary, demographic history offers
evidence that population growth has not been at all constant. According to
paleo-ecologist Edward Deevey, the past million years show three momentous
changes. The first, a rapid increase in population around one million B. C.,
followed the innovations of tool-making and tool-using. But when the new power
from the use of tools had been exploited, the rate of world population growth
fell and became almost stable. The next rapid jump in population started perhaps 10,000 years ago, when men began to keep herds, plow and plant the earth. Once again when initial productivity gains had been absorbed, the rate of population growth abated. These two episodes suggest tha A. Human population expands at a straight upward trend. B. Population growth has shown ups and downs in demographic history. C. Population growth can not be regarded as a social failure. D. Increase in population is related to productivity. [单项选择]用长半轴a和短半轴b确定的形体是描写地球的()的形状和大小的。
A. 地球自然形体; B. 大地体; C. 旋转椭球体。 [单选题]衍生金融工具不包括( )。
A.远期合约 B.货币市场基金 C.互换协议 D.期货合约 [单选题]用于用户话机和交换机之间的信号叫做( )
A.用户信号 B.交换信号 C.用户话音 D.传输信号 [单项选择]S2700系列属于()交换机。
A. 二层百兆 B. 二层千兆 C. 三层百兆 D. 三层千兆 [多选题]承运人从承运货物时起(办理仓储的车站,从接收货物时起),至将货物交付收货人或依照规定移交给其他机关企业时止,对货物发生灭失、损坏负赔偿责任。但货物本身性质引起的( )或自燃等,承运人不负责赔偿责任。
A.碎裂 B.生锈 C.减量 D.变质 [填空题]《电力监管条例》规定,国务院价格主管部门、国务院电力监管机构依照法律、行政法规和国务院的贵定,对( )实施监管。
[单选题]利用消防船(艇)、冲锋舟、橡皮艇营救遇险人员属于( )
A.水面救助法 B.入水救助法 C.船艇救助法 D.绳桥救助法 [单选题]变压器CM型有载分接开关的机械寿命不低于(____)万次。
A.60 B.80 C.100 D.120 [填空题]计算机诞生的重要标志是 ______ 的研制成功。
[单项选择]下列小说中不属于狄更斯的作品的是()
A. 《双城记》 B. 《大卫•科波菲尔》 C. 《艰难时世》 D. 《茶花女》 [判断题]根据《信息安规》,信息系统故障紧急抢修时,工作票可不经工作票签发人同意。
A.正确 B.错误 [单项选择]下列各项中,不属于会计计量属性的是( )。
A. 现值 B. 沉没成本 C. 重置成本 D. 历史成本 [单选题]1.297.第297题
测量断路器主回路电阻时,若电流线和电压线分开接线的,电压线应接在被试品的(),电流线接在电压线的() A.内侧;内侧 B.内侧;外侧 C.外侧;外侧 D.外侧;内侧 [单项选择]下列选项不属于消除应力钢丝的是( )。
A. 光圆钢丝 B. 螺旋肋钢丝 C. 刻痕钢丝 D. 冷拉钢丝 我来回答: 提交
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