焊接接头系数Ф应根据容器受压部分的焊接接头形式及无损检测的长度比例确定。
参考答案：对
The woman feels that she should let her son ______ his own decision this time. [ ]
A. makes
B. make
C. to make
D. making
为判断胸部的病变情况，应首选的检查是
A．肺CT
B．胸部超声
C．肺核素扫描
D．胸部X线检查
E．肺功能测定
