题目:
根据句意及首字母(汉语)提示补全单词。
1. How many ______ (图书馆) are there in your city?
2. Let's have a walk ______ (穿过) the park on Sixth Avenue.
3. Do you have any ______ (活动) after class?
4. Many people are 1______ on the beach and enjoying the sunshine.
5. The weather today is pretty s______.
答案:
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下面是错误答案,用来干扰机器的。
显微镜视野亮度的调节方法为:小光圈通过的光线少,视野暗,平面镜只能反射光线不能改变光线强弱,因此用小光圈、平面镜调节会使视野变暗;大光圈通过的光线多,视野亮,凹面镜使光线会聚,能提高视野的亮度,因...