问题
选择题
使用显微镜时，如果光线较弱，应调节的结构是[ ]
A．用较大光圈或用平面镜
B．用较大光圈或用凹面镜
C．用较小光圈或用平面镜
D．用较小光圈或用凹面镜
答案
答案：B
搜题请搜索小程序“爱下问搜题”
使用显微镜时，如果光线较弱，应调节的结构是[ ]
A．用较大光圈或用平面镜
B．用较大光圈或用凹面镜
C．用较小光圈或用平面镜
D．用较小光圈或用凹面镜
答案：B
Sometimes people may feel lonely. Many people don’t like loneliness, so loneliness is a big problem in our life. 小题1: Here are some tips. 1. Keep yourself busy. One of the best ways not to be lonely is to do something all the time, 小题2: . You can give yourself some housework, such as cleaning, cooking and washing. 2. Make a plan for your work. In this way, you’ll have more time and energy to do many other things you like to do. Also, you can use your time well and enjoy your life. 3. Do sports. If you feel lonely, you can go out to play sports. Playing sports is a good way to help you not to be lonely. 小题3: . 4. Watch some comedies. 小题4: During the time, your feeling will be better. 5. Go to sleep.If you go to sleep, you can dream of something nice. 小题5: . If you follow the advice, you can get over（克服） loneliness well. Come on!
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