点A位于第二象限,且它的横、纵坐标的积为﹣8,写出一个满足条件的A点的坐标( )。
(-2,4)(答案不唯一)
___________ the man who lost the purse, Mike had to stay there longer.
A.Not finding
B.Not found
C.Not having found
D.Having not found
Uras14红外线气体分析仪在什么情况下要进行相位调整?