重大医学课题研究属于()
A.公 * * 品
B.私人产品
C.混合产品
D.劣质品
参考答案:A
—Anna, can you come to play volleyball?
—________. I have to finish my work first. [ ]
A. Thanks
B. Sorry, I'm afraid I can't
C. Sure
D. OK
用手或身体任何部位不能接触设备的旋转部位及移动部位。