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【单选题】
乙酰丙酮(L)与Al3+络合物的lgK1~lgK3分别是8.6, 6.9, 5.8,则[Al3+]=[AlL2] 时的pL约为A.
8.6
B.
6.9
C.
7.8
D.
6.4
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举一反三
【单选题】古树摇曳春秋,山花自谢自开,植被茸茸生烟。
A.
Aged trees wave the spring and autumn. The flowers open and close.. the plants are thick with smoke.
B.
Aged trees wave the season amid carpets of wild flowers and thick green vegetation.
C.
. Aged trees wave the spring and autumn with flowers open and close and plants thick with smoke.
【单选题】下面程序段的时间复杂度是 ( )。 for(i=0;i for(j=1;j A[i][j]=0 ;
A.
O(n)
B.
O(m+n+1)
C.
O(m+n)
D.
O(m*n)
【单选题】—Could I have ____ dumplings? —I'm sorry. We don't have ____ dumplings here. [ ]
A.
some, some
B.
any, some
C.
some, any
D.
any, many
【简答题】下面程序段的时间复杂度是( )？count=0;for(j=1; j
【单选题】—Yesterday we learnt the fifth, ________？ —I'm sorry, Mr. Li. I don't understand everything.
A.
didn't you
B.
have you got it
C.
do you think so
D.
how about
【简答题】下面程序段的时间复杂度是 。 for(i=0;i for(j=0;j A[i][j]=0;
【简答题】A、自出生后脐带结扎至生后28天 B、自出生后脐带结扎至生后30天 C、从卵子和精子结合到小儿出生 D、从小儿出生后到满1周岁 E、从孕期满28周到生后7天 围生期是指（ ）
【简答题】维护和______是保证高速铁路安全的最基本要素之一,必须给予高度重视。
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