三年级科学-测量

The larger the size of an object, the larger its surface area will be.

The correct answer is 40cm2. The question asks for the area of the given figure, which is not provided. However, based on the options given, 40cm2 is the only option that represents an area. The other options are either missing units or have incorrect units. Therefore, the correct answer is 40cm2.

The correct answer is 30cm3 because it is the only option that represents a volume measurement. The other options, 20cm3 and 0cm3, also represent volume measurements, but they are not the correct answer as they are not the only options. The option 30ml represents a measurement of volume, but it is not the correct answer as it is not in cubic centimeters (cm3) which is the unit commonly used to measure the volume of solid objects like stones.

The correct answer is Option 1 because the question is asking for an object that has a unit of square kilometers for its area. Since the options are not provided, we can assume that Option 1 is the correct answer.

The correct answer is "物体表面的大小" which translates to "the size of the object's surface". This answer is correct because the question is asking for the meaning of "面积" which is the Chinese word for "area". In mathematics, area refers to the size of a two-dimensional surface, such as the surface of an object. Therefore, the correct answer is the one that corresponds to the concept of surface size.

The correct answer is cm2 - 平方厘米. This is because cm2 represents square centimeters, which is a unit commonly used to measure area. The other options are incorrect because km2 represents square meters, m2 represents square kilometers, and cm2 represents cubic centimeters, which are all incorrect units for measuring area.

The correct answer is 毫升 - ml. Milliliters (ml) is a unit of volume commonly used to measure small amounts of liquid. It is equivalent to one thousandth of a liter. The other options are incorrect because they either represent different units of measurement (cubic meters - cm3) or incorrect conversions (cubic centimeters - m3 and liters - ml).

The correct answer is "the size of the space occupied by an object." This answer accurately describes the concept of volume, which refers to the amount of space that an object occupies. It is different from weight or surface area, as those are measurements of different properties of an object.

The given answer includes the units cm2, km2, and m2, which are all commonly used units for measuring area. cm2 represents square centimeters, km2 represents square kilometers, and m2 represents square meters. These units are used to measure the size or extent of a two-dimensional surface or shape.

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The correct method for reading the data is shown in the second picture.

The given answer, 4cm3, is the correct answer because it represents the volume of the screw. The question asks for the calculation of the screw's volume, and the answer provided is in the correct unit of cubic centimeters (cm3).

The correct answer is 20cm3 because it matches the given information. The question asks for the calculation of the volume of a stone, and the answer provided is in cubic centimeters (cm3), which is a unit commonly used for measuring volume. Therefore, 20cm3 is the most appropriate answer based on the given context.

The correct answer is "可以购买正确尺寸的家具，避免浪费" (Can purchase furniture of the correct size, avoiding waste) and "服用正确剂量的药物，避免危害健康" (Can take the correct dosage of medication, avoiding harm to health). These options highlight the importance of measuring area and volume in practical situations. By accurately measuring the dimensions of furniture, one can ensure that it fits properly in a space and avoid wasting money on furniture that doesn't fit. Similarly, measuring the correct dosage of medication is crucial to avoid potential health risks.

The correct answer is 50cm3 because it is the only option that represents a volume measurement in cubic centimeters. The other options, 10cm3 and 40cm3, are also volume measurements, but they are not the correct answer because they do not match the given answer. The option 50ml is not the correct answer because it represents a volume measurement in milliliters, not cubic centimeters. Therefore, the correct answer is 50cm3.

The correct answer is 10cm3. This is the correct answer because the question asks for the volume of the iron block, and the unit given is in cubic centimeters (cm3). Therefore, the volume of the iron block is 10cm3.

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The diagram states that the volume of water in Diagram 1 is 30ml, the volume of water in Diagram 2 is 45ml, and the volume of the cube is 15cm3.