(一题多变题)测量前，没将游码归零就调节平衡螺母使横梁平衡，其他操作无误，测量物体质量的结果应_1(填“偏大”“偏小”或“正确”)。变式：小明同学使用托盘天平测量一铁块的质量，测量完成后发现右盘上的砝

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(一题多变题)测量前，没将游码归零就调节平衡螺母使横梁平衡，其他操作无误，测量物体质量的结果应____ (填“偏大”“偏小”或“正确”)。

变式：小明同学使用托盘天平测量一铁块的质量，测量完成后发现右盘上的砝码有一个缺了一小块，则测量值应____ (填“偏大”“偏小”或“正确”)。

上一题下一题 0.0难度选择题更新时间:2010-08-20 10:29:27

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偏大,偏大

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   Today is Saturday. It’s sunny and warm. Many children from No. 1 Middle School are at the Old People’s Home. Now, they’re helping the old people.
   Look! Li Min and Zhan Ran are cleaning the windows. Ma Lan and Liu Qian are washing clothes.
   What’s Li Na doing over there? Many old people are clapping their hands(鼓掌)for her. Oh, she’s singing for them. Her song is really beautiful. And where’s the American boy, Tom? He likes helping others and he often comes here. Listen! Who’s speaking English? It’s Tom. He’s teaching two old people to speak English.
   All the children and the old people are very happy. “We are happy when we help others, ” says Tom.

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