[单项选择]Passage Three

Space is a dangerous place, not only because of meteors but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 ream without being damaged; the figu A. it protects him against the harmful rays from space B. it provides sufficient light for plant growth C. it supplies the heat necessary for human survival D. it screens off the falling meteors 查看答案 更多"Passage Three Space is a "的相关试题: [单项选择]Passage Three Space is a dangerous place, not only because of meteors but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 ream without being damaged; the figu A. exposure to even tiny amounts of radiation is fatal B. the effect of exposure to radiation is slow in coming C. radiation is avoidable in space exploration D. astronauts in spacesuits needn’t worry about radiation damage 查看答案 [单项选择] Passage Three A. In the white pages. B. In the blue pages. C. In the yellow pages. D. In the green pages. 查看答案 我来回答: 提交 最新试题 ●    [判断题]未打开油气层前，录井作业队人员可以不参加钻井队定期组织的防喷演习。 ●    [多选题]依据《国家电网公司输变电工程标准工艺（三） 工艺标准库（2016年版）》要求，重力式块石挡 ●    [判断题]绞车主刹车在下钻或下套管时的作用是刹慢或刹住滚筒，控制下放速度，悬持钻具。 ●    [单选题]液压多功能钳的多功能刀中心销轴锁紧螺母的拧紧力矩为( )N•m。 ●    [单选题]膀胱叩诊时,排空膀胱前和排空膀胱后,叩诊音变化正确的是 ●    [判断题]执法人员有权进入营业室内查封扣划存款。（） 网站地图 我要搜题网  版权所有  ©2024  湘ICP备18016427号   购买搜题卡查看答案 [会员特权] 开通VIP， 查看 全部题目答案 [会员特权] 享免全部广告特权 推荐91天 ¥36.8 ￥80元 31天 ¥20.8 ￥40元 365天 ¥88.8 ￥188元 请选择支付方式 微信支付 支付宝支付 点击支付即表示同意并接受了《购买须知》 立即支付 系统将自动为您注册账号 已有账号登录 找回账号密码 请使用微信扫码支付 订单号： 截图扫码使用小程序[完全免费查看答案] 前往小程序 请不要关闭本页面，支付完成后请点击【支付完成】按钮 支付完成 取消支付 恭喜您，购买搜题卡成功 系统为您生成的账号密码如下： 账号 密码 重要提示：请拍照或截图保存账号密码！ 我要搜题网官网：https://www.woyaosouti.com 我已记住账号密码