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【简答题】
沾油抹布应存放在符合标准的( )容器中,并盖。
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【单选题】当发生火灾时，以下错误的做法是（ ）。
A.
可用厚重的衣物压灭身上的火苗
B.
迅速乘电梯到一楼逃生
C.
大火封门时用浸湿的衣物或棉被封堵门缝
D.
被困楼上时站在窗边等待消防人员救援
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【单选题】革兰氏染色时最好选择处于（ ）的微生物细胞进行染色
A.
A延迟期
B.
B对数期
C.
C稳定期
D.
D衰亡期
查看完整题目与答案
【单选题】The scientist's work was based on _______.
A.
occasional observations
B.
systematic observations
C.
observations of several nests
D.
observations of undisturbed nests
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【简答题】Dogs are often praised for their ________; they almost never abandon their s. A) faith B) loyalty C) trust D) truthfulness
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【单选题】This text indicates that the basic component of scientific research is ______.
A.
observation
B.
hypothesis
C.
reasoning
D.
interpretation
查看完整题目与答案
【单选题】Dogs are often praised for their ______ they almost never abandon their s.
A.
faith
B.
loyalty
C.
trust
D.
truthfulness
查看完整题目与答案
【单选题】The author implies that ______.
A.
it is sometimes easier to detect supernovas by observation of the X-ray spectrum than by observation of visible wavelengths of light
B.
life on the earth is enered by its constant exposure to radiation forces that are released by a supernova
C.
recently discovered meteorites indicate that the earth and other planets of our solar system survived the explosion of a supernova several billion years ago
D.
lighter elements are formed from heavier elements during a supernova as the heavier elements are torn apart
查看完整题目与答案
【单选题】当温度降低时,植物体内有机物的运输速率会( )。
A.
变快
B.
变慢
C.
不变
D.
先变快然后变慢
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【简答题】如图所示为滚子式对心直动从动件盘形凸轮机构。已知:圆盘半径 mm,偏心距 mm,滚子半径 mm。要求: (1)标出图示位置机构的压力角 ; (2)试计算或在图上作图标出从动件的升程h; (3)在图上标出推程角 和回程角 ; (4)确定凸轮的基圆半径r b ; (5)在图上画出凸轮的理论轮廓曲线。
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【单选题】下列说法错误的是( )。
A.
当楼房突然发生火灾时，首先要强令自己保持镇静，切不可惊惶失措，以免做出错误的决断
B.
逃生的路线要注意，朝有照明或明亮处迅速撤离
C.
着火时，若在楼梯上，往下往上跑都可以
D.
着火时，若被火档住，通过窗口或阳台等往外逃生
查看完整题目与答案
相关题目：
【单选题】当发生火灾时，以下错误的做法是（ ）。
A.
可用厚重的衣物压灭身上的火苗
B.
迅速乘电梯到一楼逃生
C.
大火封门时用浸湿的衣物或棉被封堵门缝
D.
被困楼上时站在窗边等待消防人员救援
查看完整题目与答案
【单选题】革兰氏染色时最好选择处于（ ）的微生物细胞进行染色
A.
A延迟期
B.
B对数期
C.
C稳定期
D.
D衰亡期
查看完整题目与答案
【单选题】The scientist's work was based on _______.
A.
occasional observations
B.
systematic observations
C.
observations of several nests
D.
observations of undisturbed nests
查看完整题目与答案
【简答题】Dogs are often praised for their ________; they almost never abandon their s. A) faith B) loyalty C) trust D) truthfulness
查看完整题目与答案
【单选题】This text indicates that the basic component of scientific research is ______.
A.
observation
B.
hypothesis
C.
reasoning
D.
interpretation
查看完整题目与答案
【单选题】Dogs are often praised for their ______ they almost never abandon their s.
A.
faith
B.
loyalty
C.
trust
D.
truthfulness
查看完整题目与答案
【单选题】The author implies that ______.
A.
it is sometimes easier to detect supernovas by observation of the X-ray spectrum than by observation of visible wavelengths of light
B.
life on the earth is enered by its constant exposure to radiation forces that are released by a supernova
C.
recently discovered meteorites indicate that the earth and other planets of our solar system survived the explosion of a supernova several billion years ago
D.
lighter elements are formed from heavier elements during a supernova as the heavier elements are torn apart
查看完整题目与答案
【单选题】当温度降低时,植物体内有机物的运输速率会( )。
A.
变快
B.
变慢
C.
不变
D.
先变快然后变慢
查看完整题目与答案
【简答题】如图所示为滚子式对心直动从动件盘形凸轮机构。已知:圆盘半径 mm,偏心距 mm,滚子半径 mm。要求: (1)标出图示位置机构的压力角 ; (2)试计算或在图上作图标出从动件的升程h; (3)在图上标出推程角 和回程角 ; (4)确定凸轮的基圆半径r b ; (5)在图上画出凸轮的理论轮廓曲线。
查看完整题目与答案
【单选题】下列说法错误的是( )。
A.
当楼房突然发生火灾时，首先要强令自己保持镇静，切不可惊惶失措，以免做出错误的决断
B.
逃生的路线要注意，朝有照明或明亮处迅速撤离
C.
着火时，若在楼梯上，往下往上跑都可以
D.
着火时，若被火档住，通过窗口或阳台等往外逃生
查看完整题目与答案