20.设a=(lg3)2,b=30.3,c=lg$\sqrt{3}$,则( )
A. | a<c<b | B. | c<a<b | C. | b<a<c | D. | b<c<a |
18.将log0.93,0.93,30.9按从小到大的顺序排列为( )
A. | log0.93<0.93<30.9 | B. | log0.93<30.9<0.93 | ||
C. | 30.9<0.93<log0.93 | D. | 0.93<30.9<log0.93 |
16.如图,正方形ABCD中,点E是DC的中点,CF:FB=2:1,那么$\overrightarrow{EF}$=( )
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A. | $\frac{1}{2}$$\overrightarrow{AB}$-$\frac{1}{3}$$\overrightarrow{AD}$ | B. | $\frac{1}{4}$$\overrightarrow{AB}$+$\frac{1}{2}$$\overrightarrow{AD}$ | C. | $\frac{1}{2}$$\overrightarrow{AB}$-$\frac{2}{3}$$\overrightarrow{AD}$ | D. | $\frac{1}{3}$$\overrightarrow{AB}$+$\frac{1}{2}$$\overrightarrow{AD}$ |