管道接头处理要用螺丝拧紧,(),破漏的管道要即时更换和维护。
A.拧密实
B.拧好
C.受力均匀
D.结合好
参考答案:C
The________of the research is to try and find out more about the causes of the disease.[ ]
A. suggestion
B. effort
C. form
D. purpose
肱骨外上髁炎又称为()
A.爪形手
B.网球肘
C.垂腕
D.猿手畸形
E.桡骨头炎