()是收集一手资料时最普遍采用的手段。
A.电话
B.座谈
C.问卷
D.邮寄
参考答案:C
解析:收集一手资料时最普遍采用的手段有观察法、访问法、问卷法、实验法。
The phrase "extensive muscular inhibition" means ______.
A.the body is incapable of movement
B.the muscles in the body are relaxed
C.voluntary muscles are capable of movement
D.the brain shows rapid burst of neural activity
磨削加工方法的分类是什么?