卫星地球站天线底座安装时,焊补孔洞时应使用适用于母材的焊条,每组孔眼焊补数量不得超过总数的()
A.41641
B.41642
C.41644
D.41647
参考答案:C
__________ fired, your health care and other benefits will not be immediately cut off.
A.Would you be
B.Should you be
C.Could you be
D.Might you be
观察法中最严格的一种是()。
A.科学观察
B.结构式观察
C.参与观察
D.直接观察