The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short wavelength, is scattered more efficiently than light of longer wavelengths. Although waters of the open ocean are commonly some shade of blue, especially in tropical or subtropical regions, green water is commonly seen near coasts. This is caused by yellow pigments being mixed with blue water. Phytoplankton are one source of the yellow pigment. Other microscopic plants may color the water brown or brownish-red. Near the shore silt or sediment in suspension can give waters a brownish hue; outflow of large rivers can often be observed many miles offshore by the coloration of suspended soil particles. Marine phytoplankton (Greek for "plant wanderers") are microscopic single-celled plants that include diatoms, dinoflagellates, coccolithophorids, green algae, and blue-green algae, among others. The growth of these organisms, which photosynthesize l
A. sand color
B. red pigments in coastal waters
C. blue pigment
D. reflected light and yellow pigment from plant life
| In 1830, only a few miles away from
what is now the great city of Cincinnati, lay an immense and almost unbroken
forest. The whole region was sparsely settled by people of the frontier—restless
souls who no sooner had hewn fairly habitable homes out of the wilderness and
attained to that degree of prosperity which today we should call indigence,
then, impelled by some mysterious impulse of their nature, they abandoned all
and pushed farther westward, to encounter new perils and privations in the
effort to regain the meagre comforts which they had voluntarily renounced. Many
of them had already forsaken that region for the remoter settlements, but among
those remaining was one who had been of those first arriving. He lived alone in
a house of logs surrounded on all sides by the great forest, of whose gloom and A. lost time is never found again. B. his years sat slightly on him. C. something aged him rapidly. D. he deliberately wore a white beard. [单选题]年金是在某个特定的时间段内一组时间间隔相同、金额相等、方向相同的现金流。下列不属于年金的是()。
A.养老金 B.房贷月供 C.定期定额购买基金的月投资款 D.每月家庭日用品费用支出 [单选题]当飞机中断起飞后，增压的中断方式为防止客舱高度的上升，将客舱压力恢复为？
A.起飞高度 B.起飞高度+0.1psi C.选择的FCU高度对应的客舱压力 D.客舱压力恢复为0 [单项选择]高层建筑与化学易燃物品库房的最小防火间距，不应小于（ ）
A. 40m B. 35m C. 30m D. 13m [单项选择]笔试的考察内容，不包括（）。
A. 专业知识 B. 职业知识 C. 行业知识 D. 沟通能力 [单项选择]
A. formal B. colloquial C. non-standard D. standard [单选题]公安机关接到人民警察使用武器造成无辜人员伤亡的报告后，应当及时进行勘验、调查，并及时通知当地（ ）。
A.警务督察部门 B.行政监察机关 C.人民法院 D.人民检察院 [不定项选择题]共用题干
Old and Active
It is well一known that life expectancy is longer in Japan than in most other countries.A______(51) report also shows that Japan has the longest health expectancy in the world.A healthy long life is the result of the______(52)in social environment? Scientists are trying to work______(53)exactly what keeps elderly Japanese people so healthy,and whether there is。lesson to be_____(54)from their lifestyles for the rest of us.Should we ______(55)any changes to our eating habits,for instance,or go jogging each day before breakfast?Is there some secret______(56)in the Japanese diet that is particularly______(57)to the human body? Another factor______(58)to the rapid population aging in Japan is a decline in birthrate.Although longer life should be celebrated,it is_____(59)considered a social problem.The number of older people had_(60)in the last half century and that has increased pension and medical costs.The country could soon be_(61)an economic problem,if there are so many old people to be looked ______(62),and relatively few younger people working and paying taxes to support them. ______(63)the retirement age from 65 to 70 could be one solution to the problem.Work can give the elderly a______(64)of responsibility and mission in life.It's important that the elderly play active ______(65)in the society and live in harmony with all generations. 52._________ A.increase B.progress C.growth D.improvement [判断题]( )铁路单位招收的农民合同制工人（在合同期内）和农民轮换工，本人使用乘
车证的办法与铁路职工相同，但其家属、子女不得使用乘车证。 A.正确 B.错误 [单选题]用于继电保护和控制回路的二次电缆应采用（）。
A.铜芯电缆 B.铠装屏蔽铜芯电缆 C.屏蔽电缆 D.铠装阻燃电缆 [单选题]2.23. 第23题
在电力系统正常状况下，220V供到用户受电端的供电电压允许偏差为（ ）。 A.±5% B.±7% C.+7%～-10% D.±10% [多选题]公安民警现场处置过程中出现人员伤亡的应当按照以下（）程序处置。
A.立即向所属公安机关报告 B.采取临时救治措施 C.保护现场 D.向人民检察院报告 [判断题]《广西电网调度运行操作管理规定》（桂电系统〔2020〕17号） 第4.4.3条规定：配合操作主导方确定：两个调度机构的调管范围内均有检修工作，由双方协商确定主导方。
A.正确 B.错误 [单选题] IT技术发展可以大致分为几个阶段?
A. 3 B. 4 C. 5 D. 6 [单选题]装设于（）的配电变压器应设有安全围栏，并悬挂“止步，高压危险！”等标示牌。
A.室外 B.室内 C.柱上 D.地面 我来回答: 提交
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