Eating in space is different from
eating on the earth. The food that astronauts (宇航员) carry with them does not
look like the food we eat. Some food is carried in closed bags. It is cooked and frozen (使结冰,冻结) before the astronauts get it. All the water is removed (去掉) from the food. In the space capsule (座舱), the astronaut puts the water back. He "shoots" hot or cold (寒冷的,伤风) water into the food bag with a special gun (枪,炮). He eats the food through a small hole in the bag. Other foods come in bite (咬,刺骨) sizes. The astronaut puts a whole (全部,完整的) piece in his month at once. There can be no crumbs (碎屑). Crumbs would float (飘浮,浮游物) around the capsule (胶囊,小盒) and get in the way. Meat, cake, and cereal (谷类食物) often come in bite-sized pieces. Astronauts cannot drink water fr [单项选择]经济运行的()可以用来经济学与国际经济学的关系。
A. 个体 B. 目的 C. 主体 D. 范围 [单选题]对每辆货车不固定运行区段和车站管理称具有()特点。
A.无固定检修单位 B.无固定管理单位 C.不固定使用单位 D.不固定维修单位 [单选题]GCU(发电机控制组件)控制下列哪个继电器
A.A.GCB断开 B.B.APB C.C.BTB D.D.EPC [单项选择]患者,男性,60岁,1年来在生气或劳累时发生左胸前区闷痛,伴左后背部酸痛,有时在休息时也有发生。心电图未见异常。最有价值的无创检查方法是()。
A. Holter(动态心电图)检查 B. 心脏X线检查 C. 超声心动图 D. 运动放射性核素心肌灌注显像 E. 心脏晚电位检查 [单项选择]嘌呤核苷酸从头合成时GMP的C-2氨基来自()。
A. 谷氨酰胺 B. 天冬氨酸 C. 天冬酰胺 D. 甘氨酸 [判断题]社会主义道德建设以诚实守信为重点。
A.正确 B.错误 [单选题]下列液压马达中,( )为低速马达。
A.齿轮马达 B.叶片马达 C.轴向柱塞马达 D.径向柱塞马达 [判断题]李某因盗窃他人财物被抓,其好友张某担任其担保人。张某在担当担保人期间不履行担保人义务,导致李某逃避行政拘留处罚的执行。公安机关对张某处以3000元以下罚款处罚。( )
A.正确 B.错误 我来回答: 提交
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