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【单选题】
当机械的两轴既不平行又不相交,而在空间垂直交叉时可以采用()。
A.
蜗杆传动
B.
螺旋齿轮传动
C.
圆椎齿轮传动
D.
摆线齿轮
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【简答题】When I was 16 years old, a boy gave me an important gift. It was a smile. It was the early autumn of my first year at a junior high school, and my old school was far away. As a result, no one knew who...
【单选题】从阴道后穹向上穿刺可以进入
A.
子宫腔
B.
膀胱腔
C.
膀胱子宫陷凹
D.
会阴深隙
E.
直肠子宫陷凹
【单选题】下面关于牛顿万有引力定律说法错误的是()
A.
引力大小与质点质量和距离有关
B.
严格来说仅适用于质点
C.
以欧几里得空间作为框架
D.
在万有引力定律中,时间和空间不是相互独立
【单选题】从阴道后穹向上穿刺可以进入
A.
子宫腔
B.
膀胱腔
C.
膀胱子宫深凹
D.
会阴深隙
E.
直肠子宫深凹
【单选题】Which inference is more firmly based on the information in the passage? Early one morning, a man was walking along a sandy, deserted beach. At least he thought it was deserted. As he gazed ahead of hi...
A.
The boy knows he cannot save all the starfish.
B.
The man believes the boy’s efforts are admirable.
【单选题】It was in the stone house was built as a school by local villagers the boy finished his primary school. [      ]
A.
which; that
B.
that; where
C.
which; where
D.
that; which
【单选题】It was amazing that the boy was able to solve the problem so quickly.
A.
frustrating
B.
confusing
C.
reasonable
D.
surprising
【单选题】关于牛顿第二定律,下列说法错误的是
A.
具有相对性,只能在惯性系中成立
B.
具有矢量性,可以写成分量形式
C.
在任何参考系中都成立
D.
定量体现了运动和力的瞬时对应关系
【单选题】五彩瓷的主要制作技法是
A.
单线平涂
B.
填色
C.
染色
【单选题】关于牛顿第一定律,下列说法中错误的是( )
A.
牛顿第一定律告诉我们:做匀速直线运动的物体一定不受力
B.
牛顿第一定律是在实验的基础上进一步推理而概括出来的,是一个科学的理论
C.
地球上没有不受力的物体,但受平衡力的物体可以参照牛顿第一定律进行分析
D.
控制小车从斜面同一高度滑下是为了让小车滑到水平面时的初速度相同
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