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【简答题】
It was very fine while I got up early last Sunday morning. 【S1】______ So I decided to go for a walk and took some photos in the 【S2】______ beautiful country. After breakfast, I carried my camera with 【S3】______ me and set off. Everything went smooth. I enjoyed my trip 【S4】______ so much that I didn't realize the weather had been turned 【S5】______ bad. I began to run and it was too late. I was caught 【S6】______ by the rain and was wet through. I kept on running until 【S7】______ I get to a bus stop. I stood there waiting a long time for the bus 【S8】______ shivering (颤抖) with cold. Shortly before I got home, I 【S9】______ had high fever, which made me stay in bed for a whole week! 【S10】______ 【S1】
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【单选题】与60°角终边相同的角的集合是
A.
｛αIα=60°｝
B.
｛αIα=60°+360°｝
C.
｛αIα=60°+360°k，k∈Z｝
D.
｛αIα=60°+180°k，k∈Z｝
【单选题】在pH=5.0的乙酸缓冲溶液中，用0.002mol/L的EDTA滴定同浓度的Pb2+。已知lgKPbY=18.0，lgaY(H)=6.6，lgaPb(Ac)=2.0，在化学计量点时，溶液中pPb’值应为（ ）
A.
8.2
B.
6.2
C.
5.2
D.
3.2
【单选题】在 pH=5.0 的乙酸缓冲溶液中,用 0.002mol/L 的 EDTA 滴定同浓度的 Pb2+ 。已知l gKPbY=18.0 , lg a Y(H)=6.6 , lg a Pb(Ac)=2.0 ,在化学计量点时,溶液中 pPb’ 值应为( )
A.
3.2
B.
5.2
C.
8.2
D.
6.2
【单选题】在 pH=5.0 的乙酸缓冲溶液中,用 0.002mol/L 的 EDTA 滴定同浓度的 Pb 2+ 。已知 lgK PbY =18.0 , lg a Y(H) =6.6 , lg a Pb(Ac) =2.0 ,在化学计量点时,溶液中 pPbˊ 值应为
A.
3.7
B.
4.7
C.
5.7
D.
6.7
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