问题
选择题
在新鲜血液里放入少量柠檬酸钠，静置一段时间后会出现血液分层现象，上层几乎透明的液体是
A．红细胞
B．白细胞
C．血小板
D．血浆
答案
答案：D
题目分析：新鲜动物的血液放入抗凝剂5%的柠檬酸钠（一种抗凝剂）后，由于比重不同，会出现分层现象，分为三层，上面是淡黄色半透明的血浆，中间有一层白的，是白细胞和血小板，最下面是暗红色的红细胞。
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在新鲜血液里放入少量柠檬酸钠，静置一段时间后会出现血液分层现象，上层几乎透明的液体是
A．红细胞
B．白细胞
C．血小板
D．血浆
答案：D
题目分析：新鲜动物的血液放入抗凝剂5%的柠檬酸钠（一种抗凝剂）后，由于比重不同，会出现分层现象，分为三层，上面是淡黄色半透明的血浆，中间有一层白的，是白细胞和血小板，最下面是暗红色的红细胞。
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| People in Quiet Town are very sad that their old friend, Time River, is facing the end of its life next October. The river 1 a lot to the people in the town. They all grow up and live with it all their lives. In the old times, people in the town 2 their houses on both sides of the river. The houses in each block shared a public washing room. On Mondays, people came and washed their clothes together there. They hung their clothes at the back of each house. Those clothes with different colors 3 a beautiful picture along the river. Now Time River is going to be filled in to make more land to build on. People are happy that they 4 . more living space. But at the same time, they feel sorry that they must say good-bye to their old friend. So they have decided to give a party one day a year to remember the river. hung （原形为 hang）悬挂 | ||||
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