某力在直角坐标系的投影为Fx=3kN,Fyx=4kN,此力的大小为()kN。
A.7
B.1
C.12
D.5
参考答案:D
根据P46 的课文回答下列问题。
1. What’s the boy’s name in the picture? __________ __
2. What does the boy want to be ? ___________ _
3. What does Irfan want to be? ____________
4. What makes Lucas happy? ___________ _
5. Do you think the teachers are rich? ____________
请回答天枢治疗哪些妇科病证,叙述并演示神门、天枢的定位及神门的操作。