公安机关行使公安权力是一种( )
A.司法行为
B.执法行为
C.守法行为
D.违法行为
参考答案:B
解析:行使公安权力是一种执法行为.
____ has been reported _____ sales of beef in China will increase.
A.It; which
B.It; that
C.What; that
D.That; that
(3)将叉形(两叉)网络变成等值非叉形(见图6-3),已知。x1=5,x2=10,x=15,
则
,
为( )。