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脂蛋白电泳可分为四条区带：________、________、________、________ 。
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尿素是体内________分解代谢的最终产物之一,合成尿素的主要器官是________。
当胆红素超过正常范围,但又在34.2 mmol/L以内,肉眼难于察觉,称为隐性黄疸。（）
《刑法》第116条规定：“破坏火车、汽车、电车、船只、航空器，足以使火车、汽车、电车、船只、航空器发生倾覆、毁坏危险，尚未造成严重后果的，处3年以上10年以下有期徒刑。”第117条规定：“破坏轨道、桥梁、隧道、公路、机场、航道、灯塔、标志或者进行其他破坏活动，足以使火车、汽车、电车、船只、航空器发生倾覆、毁坏危险，尚未造成严重后果的，处3年以上10年以下有期徒刑。”第118条规定：“破坏电力、燃气或者其他易燃易爆设备，危害公共安全，尚未造成严重后果的，处3年以上10年以下有期徒刑。”《刑法》第119条规定：“破坏交通工具、交通设施、电力设备、燃气设备、易燃易爆设备，造成严重后果的，处10年以上有期徒刑、无期徒刑或者死刑。过失犯前款罪的，处3年以上7年以下有期徒刑；情节较轻的，处3年以下有期徒刑或者拘役。” 阅读上述4个分则条文后，请回答下列哪些说法正确
A wheel is any dish like object that can be used for transportation or in machinery. To be useful, a wheel must revolve (1) an axle, which is normally a shaft attached (2) the wheel’s center.No one is exactly sure when the wheel was first (3) . But it is thought to have been in use during the early Bronze Age in the Tigris-Euphrates Valley in the Middle East— (4) Iraq is located today. We know that ancient people there used (5) . These and other wheeled vehicles are shown in artwork from the area (6) back to 3500 B.C.How were such (7) developed The idea began when people placed logs as rollers under a platform. They were used to (8) heavy loads. The center of the logs may have been partly hewn, or carved away, (9) a narrow axle between solid, thick wheels at each end. Some ancient Middle East people even wrapped leather tires around the solid wooden wheels attached to (10) carts.Probably the first way (11) wheels were used other than for transportation was in pottery making. (12) beautiful and useful pieces of pottery, a potter puts a lump of clay on a horizontally placed wheel which is attached to an axle. (13) the potter sits facing the wheel and makes it spin, using a foot pedal. The potter molds the clay, using both hands (14) fingers, as the wheel spins. Thus the clay is (15) . Various objects (16) bowls, plates, vases, and cups are produced in this manner.The wheel and axle also have other (17) . They are part of many (18) . An axle attached to a wheel, so that both spin at the same time, permits the use of small amounts of force to (19) very heavy load. This wheel-and-axle principle is used in all weight-lifting devices, such as cranes, hoists, and elevators. For example, by pulling a rope wrapped around the rim of a wheel, a person can lift a massive object with only a (20) amount of effort. 9().
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