皮皮学,免费搜题
登录
搜题
【简答题】
Passage One If you think a high-factor sunscreen( 防晒霜 )keeps you safe from harmful rays, you may be wrong. Research in this week's Nature shows that while factor 50 reduces the number of melanomas( 黑瘤 )and delays their occurrence, it can't prevent them. Melanomas are the most aggressive skin cancers. You have a higher risk if you have red or blond hair, fair skin, blue or green eyes, or sunburn easily, or if a close relative has had one. Melanomas are more common if you have periodic intense exposure to the sun. Other skin cancers are increasingly likely with long-term exposure. There is continuing debate as to how effective sunscreen is in reducing melanomas—the evidence is weaker than it is for preventing other types of skin cancer. A 2011 Australian study of 1,621 people found that people randomly selected to apply sunscreen daily had half the rate of melanomas of people who used cream as needed. A second study, comparing 1,167 people with melanomas to 1,101 who didn‘t have the cancer, found that using sunscreen routinely, alongside other protection such as hats, long sleeves or staying in the shade, did give some protection. This study said other forms of sun protection—not sunscreen—seemed most beneficial. The study relied on people remembering what they had done over each decade of their lives, so it's not entirely reliable. But it seems reasonable to think sunscreen gives people a false sense of security in the sun. Many people also don't use sunscreen properly-applying insufficient amounts, failing to reapply after a couple of hours and staying in the sun too long. It is sunburn that is most worrying-recent shows five episodes of sunburn in the teenage years increases the risk of all skin cancers. The good news is that a combination of sunscreen and covering up can reduce melanoma rates, as shown by Australian figures from their slip-slop-slap campaign. So if there is a heat wave this summer, it would be best for us, too, to slip on a shirt, slop on( 抹上 )sunscreen and slap on a hat.
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【单选题】汽轮机的保护装置包括超速保护装置、( )和低油压保护装置等。
A.
超压保护装置
B.
超温保护装置
C.
低真空保护装置
D.
轴向位移保护装置
【简答题】技术交底应在施工作业前由( )进行交底。
【多选题】汽轮机的常见保护系统包括( )。
A.
超速保护
B.
轴向位移保护
C.
低负荷保护
D.
低油压保护
【多选题】汽轮机的超速保护包括:
A.
OPC超速保护
B.
ETS电超速保护
C.
断流保护
D.
机械超速保护
【单选题】技术交底应在施工作业前由( )进行交底。
A.
项目技术负责人向承担施工的负责人
B.
项目经理向承担施工的负责人
C.
企业总工程师向项目技术负责人
D.
监理工程师向项目技术人员
【简答题】各类谷类种子除形态大小不一,其结构基本相似,都是由 、 、 和 。
【单选题】She did not _____ staying at home asshe had some sewing to do.
A.
matter
B.
care
C.
object
D.
mind
【多选题】【2012-73】关于基准收益率的说法,正确的有( )
A.
基准收益率是投资资金应获得的最低盈利水平
B.
测定基准收益率应考虑资金成本因素
C.
基准收益率取值高低应体现对项目风险程度的估计
D.
测定基准收益率不需要考虑通货膨胀因素
E.
债务资金比例高的项目应降低基准收益率取值
【多选题】自创专利权的成本包括
A.
研发阶段的费用化支出
B.
注册登记费
C.
研发的资本化支出
D.
研究阶段评估费
E.
研究开发过程中发生的相关税费
【单选题】技术交底应在施工作业前由( )进行交底。
A.
项目技术负责人向承担施工的负责人
B.
项目经理向承担施I的负责人
C.
企业总工程师向项目技术负责人
D.
监理工程师向项目技术人员
相关题目: