问题
判断题
力的分解即为力的投影。
答案
参考答案:错
解析:力的分解和力的投影既有根本的区别又有密切联系,分力是矢量,而投影为代数量;分力的大小等于该力在坐标轴上投影的绝对值,投影的正负号反映了分力指向。
力的分解即为力的投影。
参考答案:错
解析:力的分解和力的投影既有根本的区别又有密切联系,分力是矢量,而投影为代数量;分力的大小等于该力在坐标轴上投影的绝对值,投影的正负号反映了分力指向。
从方框的选项中选择适当的选项补全对话。 | |
B: Sorry, 1______ I'm new here. Please ask the man over there. A: Excuse me, sir. How can I get to the Slender West Lake? C: Go on and take the third turning on the left. 2______ And you'll be in front of the gate of the Slender West Lake Park. A: 3______ C: Yes, you can. A: 4______ C: You can take a No. 4 bus. A: Thank you very much. C: 5______ |