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【单选题】
质量为1kg的质点在xOy平面内运动,已知运动方程为r=3ti+2t2j(SI)。则质点在第1s末的动能Ek=( )。A.
12.5 J
B.
15 J
C.
25 J
D.
36.5 J
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【单选题】—I felt very __________ when I was having classes this morning. —Did you stay up very late last night?
A.
relaxed
B.
sleepy
C.
nervous
D.
sick
【单选题】已知 KMnO 4 浓度为 0.02000 mol/L , 对 Fe 3 O 4 的的滴定度为 ( )
A.
0.5600 g/mL
B.
0.0232 g/mL
C.
0.0112 g/mL
D.
0.0056 g/mL
【简答题】Today I felt very u ncomfortable studying English as usual．My eyes were 36 and my mind was confused．I buried my head deep in the great pile of books．Many vocabulary words 37 my mind．As more and more e...
【单选题】已知c(KMnO4)= 0.02000 mol/L,则c(1/5 KMnO4)为( )。
A.
0.02000 mol/L
B.
0.1000 mol/L
C.
0.01000 mol/L
D.
0.004000 mol/L
【简答题】阅读理解。 I felt very sad because I was not able to get the ticket to the film Hero last Friday. I learned from the newspaper that tickets could be bought at the cinema box office in Richland Hills any da...
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