| As in the field of space travel, so in
undersea exploration new technologies continue to appear. They share a
number of similarities with each other — as well as some important
differences. Manned submersibles (潜水器), like spaceships, must maintain living conditions in an unnatural environment. But while a spaceship must simply be sealed against the vacuum of space, a submersible must be able to bear extreme pressure if it is not to break up in deep water. In exploring space, unmanned vehicles were employed before astronauts. In undersea exploration, on the other hand, men paved the way, only recently have unmanned remote-operated vehicles (ROVs) been put to use. One reason for this is that communicating with vehicles in orbit is much easier than talking to these underwater. A vacuum am ideal medium for radio communi A. it is not affected Earth’s gravity B. most undersea vehicles operate at the end of long ropes C. ROVs have been put to use D. there is no need for submersibles to get away from Earth’ s gravity [单项选择]采样环境中如有烟尘，应在吸附采样管前加一根前置柱，柱内填充（），防止采样时烟尘污染采样管。
A. GDX-102 B. TDX-01 C. 玻璃微珠 [填空题]牵引工况，预备环节的完成必须具备条件是：司机操作的钥匙已给上，即570QS打到“1”位、（ ）、主断路器已合上、劈相机已开始工作、高级位时风速延时必须完成。
[单项选择]葡萄糖最大重吸收量测定（）
A. 肾小球滤过功能检查 B. 肾小球滤膜屏障功能检查 C. 肾小管重吸收功能检查 D. 肾小管酸碱平衡调节功能检查 E. 肾小管水、电解质调节功能检查 [填空题]常见的浓缩方法：（）
[单选题]构件受到剪切作用时,其剪切面上的内力和应力分别是( )
A.内力为剪力,应力正应力 B.内力为轴力,应力为正应力 C.内力为剪力,应力为剪应力 D.内力为轴力,应力为剪应力 [单项选择]著名学者钱穆认为，唐代“在三省体制下，决策不再是单纯的皇帝个人行为，皇帝的最后决定权包含在政务运行的程式中”。唐代三省的“运行程式”是（）
A. 中书省→门下省→尚书省 B. 尚书省→门下省→中书省 C. 尚书省→中书省→门下省 D. 中书省→门下省→尚书省 [判断题]高架绝缘斗臂车应经检验合格。斗臂车操作人员应熟悉带电作业的有关规定，并经专门培训上岗。
A.正确 B.错误 [多选题]《铁路旅客运输管理规则》第49条规定，到达的行包要妥善保管，（）。
A.A、及时通知 B.B、准确验货 C.C、核对票据 D.D、对交付 我来回答: 提交
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