1/5单选题
难度：
1.下列方案能使图中轻质杠杆保持平衡的是（ ）
| A | 在a处挂9个质量相同的钩码 |
| B | 在b处挂8个质量相同的钩码 |
| C | 在c处挂6个质量相同的钩码 |
| D | 在d处挂2个质量相同的钩码 |
正确答案：Qw==
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
