国内异地引进()应先到动物防疫监督机构办理审批手续。
A.种用动物
B.肉用动物
C.观赏动物
参考答案:A
A: Firstly, allow me to introduce myself. My name is John Brown, manager of the company. B: ______
A.You must be mistaken. I don't know you at all.
B.Hello, Brown, I haven't seen you for ages.
C.Very nice to see you, Mr. Brown.
D.Hi, John! Welcome to our company.
如图为某举重运动员在0.5s内由支撑到起立将杠铃举起过程中拍摄的两张照片,杠铃的质量为100kg,则杠铃重为 N.已知照片中杠铃的实际直径是40cm,根据照片可算出该运动员在上述过程中对杠铃做功的平均功率约为 W.(g取10N/kg)