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【单选题】
在电梯内用弹簧秤称量物体的重量, 当电梯静止时称得一物体重量50kg, 当电梯作匀变速运动时称得其重量为40kg, 则该电梯的加速度A.
大小为 < xmlnamespace prefix="st1" ns="urn:schemas-microsoft-com:office:smarttags"> 0.2 g , 方向向下 xmlnamespace>
B.
大小为 < xmlnamespace prefix="st1" ns="urn:schemas-microsoft-com:office:smarttags"> 0.2 g , 方向向上 xmlnamespace>
C.
大小为 < xmlnamespace prefix="st1" ns="urn:schemas-microsoft-com:office:smarttags"> 0.8 g , 方向向上 xmlnamespace>
D.
大小为 0.8 g , 方向向下
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举一反三
【单选题】Lincoln’s mother did ___ many books ___ him.
A.
what she had buy, to
B.
what she could buy, for
C.
all that she had to buy, to
D.
all she could buy, for
【单选题】What did Ken suggest at the end of the conversation?
A.
Buy a new Honda.
B.
Buy insurance for their cars.
C.
Buy a better car.
D.
Take a bus.
【单选题】--- What a beautiful car! When ________ you ________ it? --- I ________ it for two years.
A.
did; buy; bought
B.
did; buy; have had
C.
have; bought; have bought
D.
have; bought; have had
【判断题】在AutoCAD2018中，使用直线命令“line”画出一个矩形，该矩形中有1个图元实体；使用多段线命令“pline”画出一个矩形，该矩形中有4个图元实体。
A.
正确
B.
错误
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