题目内容
(请给出正确答案)
[单选题]
While I () the bus, it started to rain.
A.was waiting for
B.waited for
C.am waiting for
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A.was waiting for
B.waited for
C.am waiting for
A.second
B.last
C.latter
D.later
A.horrified
B.terror-struck
C.terrorized
D.terrified
A.judging by
B.judging at
C.judged by
D.judged from
设a,b1,b2,···,br都是布尔代数的原子,那么当且仅当存在着i(1 ≤i ≤r)使得a=b.。
Ⅰ.A×(P/A,i,5)×(P/S,i,3)
Ⅱ.A×(P/A,i,5)×(P/S,i,2)
Ⅲ.A×(P/A,i,7)-A×(P/A,i,2)
Ⅳ.A×(P/A,i,7)-A×(P/A,i,3)
Ⅴ.Ⅰ、Ⅲ
A.Ⅱ、Ⅳ
B.Ⅰ、Ⅳ
C.Ⅱ、Ⅲ
A.Pi>=0和∑Pi=0(i=1,2,……)
B.Pi=0和∑Pi>0(i=1,2,……)
C.Pi>=0和∑Pi=1(i=1,2,……)
D.Pi=0和∑Pi=1(i=1,2,……)