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About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and the usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require energy, of course. The process of respiration uses sugar to make the high energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen. The study of isolated roots has provided an understanding of the relationship between shoots and roots in intact plants. The leaves of the shoots provide the roots with sugar A. make proteins B. obtain fresh air C. produce inorganic nitrogen D. carry out activities without energy [判断题]当手持式验票机发生故障或送修时，采取 BOM 验票。
A.正确 B.错误 [单选题]哺乳期妇女适宜的避孕措施为
A.服用探亲片一号 B.服用探亲避孕丸 C.放置宫内节育器 D.注射长效针剂 E.服用复方长效避孕药 [单选题]下列哪项不属于火灾的灾害类型?( )
A.建筑火灾、地下建筑火灾 B.石油化工火灾、人员密集场所火灾 C.交通工具火灾、仓库火灾 D.自然灾害事故、重大安全生产事故 E.工厂火灾、特殊情况下火灾及其他火灾 [简答题]官兵关系是如何规定的？
[单项选择]How men first learned to invent words is unknown; (1) , the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain (2) to express thoughts and feelings, actions and things, (3) they could communicate with each other; and that later they agreed (4) certain signs, called letters, which could be (5) to represent those sounds, and which could be (6) .Those sounds, whether spoken, (7) written in letters, we call words.
The power of words, then, lies in their (8) —the things they bring up before our minds. Words become (9) with meaning for us by experience; (10) the longer we live, the more certain words (11) to us the happy and sad events of our past: and the more we (12) , the more the number of words that mean something to us (13) . Great writers are those who not only have great thoughts but also express t A. reappear B. recall C. remember D. recollect [单项选择]一般只重磨后刀面的刀具有（）
A. 焊接车刀、铣刀、麻花钻 B. 铲齿成形铣刀、麻花钻、铰刀 C. 麻花钻、铰刀、尖齿成形铣刀 D. 铰刀、尖齿成形铣刀、拉刀 [单项选择]对定期考核不合格的医师，县级以上人民政府卫生行政部门可以（）
A. 吊销其医师执业证书 B. 责令其暂停执业活动3～6个月，并接受培训和继续医学教育 C. 降低其执业等级 D. 变更其工作岗位 E. 给予行政或纪律处分 [单选题] 闸刀开关、按钮开关、司机控制器属于（）电器。
A.自动 B.手动 C.调节 [判断题]SF6断路器（开关）进行操作时，禁止检修人员在其外壳上进行工作。
A.正确 B.错误 [单选题]在信贷管理系统中，（ ）进行一次五级分类。
A.3个月 B.10 C.6个月 D.1个月 我来回答: 提交
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