显微镜目镜上刻有“15×”的字样，表示______．若使用这一目镜，同时使用10倍物镜，则被观察的物体被放大了______倍．
显微镜目镜上刻有“15×”的字样，表示放大倍数是15倍，显微镜的放大倍数的计算方法是目镜的放大倍数与物镜放大倍数的乘积．其放大倍数是15×10═150（倍）．所以使用显微镜时，如果物镜上标有15X的字样，目镜上标有10X的字样，那么观察到的物体放大倍数是150倍．
故答案为：15倍；150．
| 完形填空。 | ||||
| In reallife, robots are mainly used in factories. They do many different jobs. Usually these jobs are too 1 , difficult or boring for humans. Robots also help disabled people and people who cannot look after 2 . For example, scientists are making a robot to help 3 people. Now many of them have a dog to help them. The dog is called a guide dog. In the future, guide dogs might be robot dogs. One robot dog is called Meldog. It has wheels. It usually "walks" 4 its owner. It is very clever. It knows the speed of its owner's walk. Meldog talks to its owner by 5 . The owner wears a special belt. This belt 6 instructions to the owner from Meldog such as "Stop here","Turn left" and"Turn right". In the United States, another 7 of robot helps disabled workers. This robot, called Kilroy, helps disabled computer operators. The robot 8 the sound of its owner's voice. It follows instructions such as "Turn the page" and"Make a cup of coffee". Robots are also used in American 9 . They can do simple jobs. For example, they shave (刮脸) patients and brush their teeth and take meals from the kitchen to patients' rooms. It never gets lost 10 this robot has a map of the hospital in its computer memory. | ||||
|