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题目来源：
OG8 阅读 Q30
正确答案：C
题目详解
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Choice C is the best answer. The lower graph, which shows the "tip moving away from salt surface," indicates that when the microscope tip was 15 nanometers from the surface, the force on the tip was approximately 0.75 micronewtons.
Choices A, B, and D are incorrect because the graph shows that when the microscope tip was 15 nanometers from the salt surface, the force on the tip was approximately 0.75 micronewtons, not 0 micronewtons (choice A), 0.25 micronewtons (choice B), or 1.25 micronewtons (choice D).
Choices A, B, and D are incorrect because the graph shows that when the microscope tip was 15 nanometers from the salt surface, the force on the tip was approximately 0.75 micronewtons, not 0 micronewtons (choice A), 0.25 micronewtons (choice B), or 1.25 micronewtons (choice D).
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