下列物质中,氮元素的百分含量最高的是( )
A.NH3
B.NH4HCO3
C.(NH4)2SO4
D.CO(NH2)2
答案:A
While we were running on the playground, Jack suddenly stopped____ and lay on the ground,so we all stopped_____ what was wrong with him.
A.to run; to see
B.running; seeing
C.running; to see
D.running; see
依照《行政处罚法》的规定,移送管辖是指违法行为构成犯罪的,行政机关必须将案件移送( )。
A.司法机关
B.公安机关
C.上级行政机关
D.监察机关