曲柄摇杆机构演变为曲柄滑块机构的演变方法是（ ）。B．A．扩大转动副 B. 转动副变移动副 C. 取不同构件为机架
A. 扩大转动副
B. 转动副变移动副
C. 取不同构件为机架
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图2中，P13位于（ ）点。
A. E
B. F
C
图1机构的自由度为（ ）
A. 1
B. 2
C. 3
（ ）是机构中的最小运动单元。
A. 零件
B. 构件
C. 运动副
Why is it important to consider what the Anthropocene will be like to live in? (Please choose all that apply)
A. Because people's vision of the future will influence their actions today which in turn will influence what the future will be like
Because thinking about the future allows us to consider indirect consequences of human action
C. Because the Anthropocene is produced by human action and human action will be shaped by the state of world
D. Because we need to plan for the future of the Anthropocene
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