The safety of mobile phones (U. S. cell-phones) seems to face new questions after British researchers found that microwave emissions can affect the health of earthworms in unexplained ways.
The larvae of tiny soil worms called nematodes grew faster and became more (1) after they were (2) for a long time to weak microwave radiation, of the (3) strength and frequency as that (4) by mobile phones, they found.
Why this occurred is (5) , and there is no evidence that human health is also affected. But, they warn, the finding challenges the standards which (6) whether a mobile is safe or not.
These standards are based on whether the radiation is strong enough to cause a batch of (7) to warm up. Heat causes the chemical bonds in cells to (8) , a disruption that can be a potential (9) for cancer.
The research, led by David de Pomerai at Nottingham University, central England, s
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[单项选择]影响城市形态及其结构变化的集中力因素不包括( )。
A. 能源费用的增长和能源供给的不确定性 B. 贫困化城市下层居民的残留 C. 旧公共交通的混杂和运输费用的增加 D. 特定经济活动中面对面接触的必要性依然存在 [简答题]A公司决定和B公司进行非货币交换,A、B公司的增值税税率为17%,计税价格等于公允价值。整个交易过程中没有发生除增值税(甲、乙商品增值税税率17%)、消费税(乙商品消费税税率17%)和营业税(无形资产税税率5%)以外的其他相关税费。有关资料如下:(1)A公司换出:固定资产——机床;原价为100000元,累计折旧50000元,公允价值为75000元;换入乙商品作为固定资产管理;(2)B公司换出:库存商品——乙商品;账面价值为80000元,公允价值为75000万元。换入机床作为固定资产管理。要求:编制A公司和B公司的会计分录。
[判断题]只有单位对建筑工程的质量事故、质量缺陷有权向建设行政主管部门或者其他有关部门进行检举、控告、投诉。( )(中华人民共和国主席令第二十九号《中华人民共和国建筑法》第六十三条)
A.正确 B.错误 [判断题]止血带既能用于捆扎四肢,也能捆扎头部、颈部或躯干部。( )
A.正确 B.错误 [单选题]任何单位和个人不得占用变电设备用地,输电线路走廊和( )。
A.电缆通道 B.电线 C.电杆 D.电话 [单选题]布鲁纳提出的学习理论是
A.认知目的说 B.认知同化说 C.认知发现说 D.认知接受说 我来回答: 提交
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