黄金首饰深受大家的喜爱，许多不法商人利用这一点，生产假黄金以获取更多的利益．假黄金是铜和锌的合金，其颜色和外形与黄金相似．下列方法中，不能区分真黄金与假黄金的是（ ）
A．观察颜色
B．放在HCl中
C．在空气中高温加热
D．放入AgNO3溶液中
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什么叫折射角？
| 根据句子意思，用所给动词的适当形式填空。 | |
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| 1. Everybody agreed that they ______ by Miss Liu's beautiful songs. 2. Researchers are trying ______low exam results to large class sizes. 3. Stone tools of this kind have been found in tombs that _____ the Song Dynasty. 4. Machines ______ to get in the crops can be bought at lower prices now. 5. If we _______this evening, we can leave first thing in the morning. 6. The music lovers were mad with joy, ______ along to nearly every song during the concert. 7. It is also the most exciting city in New Zealand with people of many different cultures _____ there. 8. He worked as a ballet dancer in London before _______in America in 1987. 9. Do you ______coming on a day trip to Fuzhou next Saturday? 10. In the last few years, the scientists ______the drug on animals for thousands of times. |
红细胞代谢能源主要来自（ ）
A．血脂
B．血糖
C．糖酵解产生ATP
D．蛋白质代谢
E．以上都是
将PBMC悬液注入装有葡聚糖凝胶SephadexG-10柱中，先从柱上洗脱下细胞主要是（）。
A.T细胞
B.单核细胞
C.B细胞
D.PBMC中混入的杂质细胞
E.淋巴细胞
选择疼痛评估工具时，要考虑到患者的（）
A.患者的意愿
B.患者的治疗目标
C.患者的认知能力
D.患者的护理目标