波尔多液农药不能用铁制容器盛放.在该反应中铁是( )
A.氧化剂
B.还原剂
C.催化剂
D.发生了还原反应
答案:B
It is in the hotel _____ he stayed last night ______ he lot his mobile phone.
A.that ; that
B.that ; where
C.that; when
D.where; that
下列程序段的执行结果为 ______。 Dim m(3,3)As Integer Dim i As Integer Dim j As Integer Dim x As Integer For i=1 To 3m(i,i)=i Next For i=0 To 3For j=0 To 3 x=x+m(i,j)Next Next Print x
A.3
B.4
C.5
D.6