问题
选择题
| We don't know ________. It is said that she would come tomorrow. |
A. how she will come B. when she came C. when she will come D. when she comes |
答案
答案：C
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| We don't know ________. It is said that she would come tomorrow. |
A. how she will come B. when she came C. when she will come D. when she comes |
答案：C
的木块1、2、3,1和2及2和3间分别用原长为L，劲度系数为k的轻弹簧连接起来，木块与传送带间的动摩擦因数为μ，现用水平细绳将木块1固定在左边的墙上，传送带按图示方向匀速运动，当三个木块达到平衡后，1、3两木块之间的距离是( )
