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【单选题】
某一医生用拔牙钳先后拔除上颌中切牙和侧切牙时，他发现在同样施用旋转力的方式，而且拔牙钳安放位置正确，的大小和速度基本一致情况下，侧切牙的牙根尖三分之一断在牙槽窝内，断根最有可能的原因是A.
侧切牙的牙根比中切牙的牙根更易折断
B.
侧切牙牙根尖三分之一常有弯曲，施用旋转力拔除时较易折断
C.
拔除侧切牙时，旋转力施用不够
D.
与拔除中切牙和侧切牙的先后顺序有关
E.
以上都不是
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【简答题】drive/draiv/
【简答题】根据所给句意和音标，从每题A、B、C、D四个选项中，选出一个最佳答案。 小题1:We’ll have an English ________ / test / tomorrow. A．take B．team C．taxi D．test 小题2:I want a pet ________/ kæt /. A．cat B．cut C．kite D．kid 小题3:Could you please __...
【简答题】drive/draiv/
【单选题】Magnetic compass deviation______．
A.
varies depending upon the bearing used
B.
is the angular difference between magnetic north and compass north
C.
is published on the compass rose on most nautical charts
D.
is the angular difference between geographic and magnetic meridians
【判断题】A rotation can be described in angular position, angular displacement, angular velocity, and angular acceleration.
A.
正确
B.
错误
【多选题】What of the following description about giving angular dimensions are correct?
A.
The boundary lines or the extents of them can be the extension lines of an angular dimension.
B.
The dimension line of an angular dimension is an arc with certain radius, and the carter of the arc is the vertex of the angle.
C.
The dimension figure of an angular dimension can be drawn horizontally or leftward.
D.
The dimension figures of an angular dimension can be placed in the breaks, above or at the sides of the extension lines, or above leader lines which are drawn start from dimension lines.
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