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】一次投料法是按____________________的次序投料,并在搅拌的同时加入全部拌和水进行搅拌。
A.
砂——石子——水泥
B.
砂(石子)——水泥——石子(砂)
C.
水泥——砂——石子
D.
水泥——石子——砂
【单选题】药物通过细胞膜转运的特点 下列哪项 正确
A.
被动转运的物质可由高浓度区向低浓度区转运,不耗能
B.
主动转运要借助载体,故不需消耗能量
C.
主动转运不会出现饱和现象
D.
被动转运物质经载体也可由低浓度区向高浓度区转运
【单选题】入汤剂需要包煎的药物是
A.
钩藤
B.
滑石粉
C.
麻黄
D.
阿胶
E.
生地
【判断题】测定微量含金矿物中的含金量,常用活性炭进行吸附,使金元素富集到活性炭中,该种吸附属于化学吸附
A.
正确
B.
错误
【判断题】测定微量含金矿物中的金含量,常用活性炭进行吸附,使金元素富集到活性炭中,该种吸附属于化学吸附。
A.
正确
B.
错误
【单选题】图示连续梁 (EI= 常数 ) ,3单元的等效荷载矩阵为 ( )
A.
B.
C.
D.
D
【单选题】下列关于皮质核束说法哪项是错误的()
A.
经内囊膝部下行
B.
舌下神经核仅受对侧皮质核束支配
C.
一侧受损,对侧面部表情肌瘫痪
D.
止于脑干内的脑神经躯体运动核和特殊内脏运动核
E.
又称皮质延髓束或皮质脑干束
【简答题】乙产品有两道工序制成。原材料不是在开始时一次投入,而是在每道工序生产开始以后陆续投入。第一道工序原材料消耗定额为 280 公斤,月末在产品数量 3200 件;第二道工序原材料消耗定额为 220 公斤,月末在产品数量 2400 件。完工产品为 8200 件,月初在产品和本月发生的实际原材料费用累计 493560 元。 要求:( 1 )计算 第一道 工序 的投料程度为( );第二道工序的投料程度为( ...
【单选题】入汤剂需要包煎的药物是
A.
人参
B.
西洋参
C.
羚羊角
D.
连翘
E.
辛夷
【单选题】混凝土应搅拌均匀,按正确顺序上料,按二次投料法搅拌混凝土,正确的投料顺序是()
A.
砂子一水泥一水一石子
B.
水泥一砂子一水一石子
C.
石子一水泥一水一砂子
D.
砂子一石子一水一水泥
相关题目: