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【判断题】
矩阵测光(又称“评价测光”或“平均测光”),被拍摄对象与背景的亮度反差较小的情况下采用,比如风景照、或者抓拍。A.
正确
B.
错误
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举一反三
【简答题】真空中有一根半径为r的无限长直圆柱形导线，其轴线OO'沿铅垂方向．沿轴线方向通有电流I，电流均匀分布于横截面内，在距轴线3r处有一个电荷量为-e的电子，沿平行于OO'轴方向以速度v向下运动，如图所示．求电子所受的磁场力．
【单选题】More and more shops use the paper bags to take the place of the ones.
A.
plastic
B.
metal
C.
cloth
D.
glass
【简答题】Online shopping is becoming more
and more popular for a number of reasons; prices are often lower online and
you don’t have to queue up in busy shops.
【简答题】Online shopping is becoming more and more popular for a number of reasons; prices are often lower online and you don’t have to queue up in busy shops.
【单选题】With Christmas ______, more and more people come to shops to buy gifts.
A.
arranging
B.
appointing
C.
approaching
D.
applying
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