问题
选择题
| Ely worked late in the evening to finish her report _____ her boss could read it next morning. |
| A. when B. though C. before D. so that |
答案
答案：D
搜题请搜索小程序“爱下问搜题”
| Ely worked late in the evening to finish her report _____ her boss could read it next morning. |
| A. when B. though C. before D. so that |
答案：D
，边长为
的正方形磁场区域对称分布在线图下边的两侧，如图甲所示，磁场方向垂直纸面向里，大小随时间变化如图乙所示，从t=0开始经时间t0细线开始松驰，g=10m/s2。求：
