【单选题】setTimeout("alert("this is a i"),20)的执行结果是
【判断题】相关系数数值越大,说明相关程度越高;相关系数数值越小,说明相关程度越低。( )
【单选题】人口红利是指一个国家的劳动年龄人口占总人口比重较大,抚养率比较低,为经济发展创造了有利的人口条件。目前,我国正处于人口红利的( )阶段
【单选题】听力原文: Butterflies are common all over the world but the ones in hot countries are usually bigger and more brightly colored than those in cooler countries, and there are more different kinds. Usually t...
A.
A male butterfly in a hot country.
B.
A female butterfly in a hot country.
C.
A dead leaf butterfly with its wings closed.
D.
A large, heavy butterfly.
【简答题】“人口红利”指一个国家的劳动年龄人口占总人口比重较大,人口抚养率比较低,为经济发展创造了有利的条件。20世纪80年代,我国开始进入“人口红利”期。 小题1:“人口红利”期容易出现的社会问题有 A.社会储蓄率低,不利于经济增长 B.青壮年劳动力多,就业压力大 C.少年儿童比重高,人口增长过快 D.社会赡养费用高,财政压力大 小题2:预计2015年前后,我国达到“人口红利”高峰,“人口红利”期结束后,...
【单选题】Science Fiction 1. Among the most popular books being written today are those that are usually classified(分类) as science fiction. Hundreds of titles are published every year and are read by all kinds ...
A.
Fairly New Development
B.
Classics of Science Fiction
C.
Difficulty in Keeping ahead of Scientific Advances
D.
Origins of Science Fiction
E.
Themes of Modern Science Fiction Paragraph 2______
【单选题】Alert类中的setTimeout()的方法参数的单位是