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【多选题】
下列滚动轴承密封装置中,( )属于非接触式密封。
A.
毡圈密封
B.
甩油密封
C.
密封环密封
D.
密封
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参考答案：
举一反三
【判断题】秩序是人类一切活动的必要前提，是社会发展所应追求的基本价值
A.
正确
B.
错误
查看完整题目与答案
【单选题】如图所示,弹簧测力计下挂着铁块P,其正下方的水平地面上放着一块条形磁铁Q,P和Q均处于静止状态。已知P和Q的重力分别为G和3G,若弹簧测力计的示数为2G,则下列说法正确的是( )
A.
P对弹簧测力计的拉力等于G
B.
P对Q的吸引力和地面对Q的支持力大小分别为G和2G
C.
P在两个力的作用下处于平衡状态
D.
弹簧测力计对P的拉力和Q对P的吸引力是一对平衡力,大小均为2G
查看完整题目与答案
【单选题】如图所示,弹簧测力计下挂着铁块P,其正下方的水平地面上放着一块条形磁铁Q,P和Q均处于静止状态。已知P和Q的重力分别为G和3G,若弹簧测力计的示数为2G,则下列说法正确的是
A.
P对弹簧测力计的拉力大小为G
B.
P对Q的吸引力和Q对P的吸引力是一对平衡力,大小均为G
C.
P对Q的吸引力和地面对Q的支持力大小分别为G和2G
D.
弹簧测力计对P的拉力和Q对P的吸引力是一对平衡力,大小均为2G
查看完整题目与答案
【单选题】What is true about B1 cells
A.
It is usually called B cell
B.
It's the majority of B cells
C.
Primary cell of specific humoral immunity
D.
self-renewal
E.
high frequency somatic mutation
查看完整题目与答案
【多选题】How do cell-suce receptors relay extracellular signals via intracellular signaling pathways?
A.
The majority of extracellular signal molecules are proteins, peptides, or small, hydrophilic molecules that bind to cell-suce receptors that span the plasma membrane. Transmembrane receptors detect a signal on the outside and relay the message, in a new form, across the membrane into the interior of the cell.
B.
The receptor protein performs the primary step in signal transduction: it recognizes the extracellular signal and generates new intracellular signals in response.
C.
The resulting intracellular signaling process usually works like a molecular relay race, in which the message is passed “downstream” from one intracellular signaling molecule to another, each activating or generating the next signaling molecule in the pathway, until a metabolic enzyme is kicked into action, the cytoskeleton is tweaked into a new configuration, or a gene is switched on or off.
D.
This final outcome is called the response of the cell.
查看完整题目与答案
【判断题】栽培灵芝的树种,不能使用松、柏、桉等含有芳香类物质的树种,会抑制菌丝生长。
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文： Students sitting the National College Entrance Exam are likely to see cell phone signals blocked inside exam sites this year to pr cheating. While education authorities said they would use ...
A.
To increase the number of exam supervisors.
B.
To ban handsets from exam rooms.
C.
To equip exam sites with cell phone signal shielding facilities.
D.
To impose severe punishment on cheating students.
查看完整题目与答案
【单选题】如图所示,弹簧测力计下挂着铁块 P,其正下方的水平地面上放着一块条形磁铁 Q,P 和 Q 均处于静止状态.已知 P 和 Q 的重力分别为 G 和 3G,若弹簧测力计的示数为 2G,则下列说法正确的是( )
A.
P 对弹簧测力计的拉力大小为 G
B.
P 对 Q 的吸引力和地面对 Q 的支持力大小分别为 G 和 2G
C.
P 对 Q 的吸引力和 Q 对 P 的吸引力是一对平衡力,大小均为 G
D.
弹簧测力计对 P 的拉力和 Q 对 P 的吸引力是一对平衡力,大小分别均为 2G
查看完整题目与答案
【单选题】纯铁在在600度时为( )晶格。
A.
体心立方
B.
面心立方
C.
密排六方
D.
复杂斜方
查看完整题目与答案
【简答题】从A、B、C、D中选择最恰当的选项填进文章中去，你会读到一个有意思的故事。 Do you like pop music? Most people do. One of the best 1 on the music scene is the New Ocean Waves. In the 2 twelve months, they've had three major 3 and made a h...
查看完整题目与答案
相关题目：
【判断题】秩序是人类一切活动的必要前提，是社会发展所应追求的基本价值
A.
正确
B.
错误
查看完整题目与答案
【单选题】如图所示,弹簧测力计下挂着铁块P,其正下方的水平地面上放着一块条形磁铁Q,P和Q均处于静止状态。已知P和Q的重力分别为G和3G,若弹簧测力计的示数为2G,则下列说法正确的是( )
A.
P对弹簧测力计的拉力等于G
B.
P对Q的吸引力和地面对Q的支持力大小分别为G和2G
C.
P在两个力的作用下处于平衡状态
D.
弹簧测力计对P的拉力和Q对P的吸引力是一对平衡力,大小均为2G
查看完整题目与答案
【单选题】如图所示,弹簧测力计下挂着铁块P,其正下方的水平地面上放着一块条形磁铁Q,P和Q均处于静止状态。已知P和Q的重力分别为G和3G,若弹簧测力计的示数为2G,则下列说法正确的是
A.
P对弹簧测力计的拉力大小为G
B.
P对Q的吸引力和Q对P的吸引力是一对平衡力,大小均为G
C.
P对Q的吸引力和地面对Q的支持力大小分别为G和2G
D.
弹簧测力计对P的拉力和Q对P的吸引力是一对平衡力,大小均为2G
查看完整题目与答案
【单选题】What is true about B1 cells
A.
It is usually called B cell
B.
It's the majority of B cells
C.
Primary cell of specific humoral immunity
D.
self-renewal
E.
high frequency somatic mutation
查看完整题目与答案
【多选题】How do cell-suce receptors relay extracellular signals via intracellular signaling pathways?
A.
The majority of extracellular signal molecules are proteins, peptides, or small, hydrophilic molecules that bind to cell-suce receptors that span the plasma membrane. Transmembrane receptors detect a signal on the outside and relay the message, in a new form, across the membrane into the interior of the cell.
B.
The receptor protein performs the primary step in signal transduction: it recognizes the extracellular signal and generates new intracellular signals in response.
C.
The resulting intracellular signaling process usually works like a molecular relay race, in which the message is passed “downstream” from one intracellular signaling molecule to another, each activating or generating the next signaling molecule in the pathway, until a metabolic enzyme is kicked into action, the cytoskeleton is tweaked into a new configuration, or a gene is switched on or off.
D.
This final outcome is called the response of the cell.
查看完整题目与答案
【判断题】栽培灵芝的树种,不能使用松、柏、桉等含有芳香类物质的树种,会抑制菌丝生长。
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文： Students sitting the National College Entrance Exam are likely to see cell phone signals blocked inside exam sites this year to pr cheating. While education authorities said they would use ...
A.
To increase the number of exam supervisors.
B.
To ban handsets from exam rooms.
C.
To equip exam sites with cell phone signal shielding facilities.
D.
To impose severe punishment on cheating students.
查看完整题目与答案
【单选题】如图所示,弹簧测力计下挂着铁块 P,其正下方的水平地面上放着一块条形磁铁 Q,P 和 Q 均处于静止状态.已知 P 和 Q 的重力分别为 G 和 3G,若弹簧测力计的示数为 2G,则下列说法正确的是( )
A.
P 对弹簧测力计的拉力大小为 G
B.
P 对 Q 的吸引力和地面对 Q 的支持力大小分别为 G 和 2G
C.
P 对 Q 的吸引力和 Q 对 P 的吸引力是一对平衡力,大小均为 G
D.
弹簧测力计对 P 的拉力和 Q 对 P 的吸引力是一对平衡力,大小分别均为 2G
查看完整题目与答案
【单选题】纯铁在在600度时为( )晶格。
A.
体心立方
B.
面心立方
C.
密排六方
D.
复杂斜方
查看完整题目与答案
【简答题】从A、B、C、D中选择最恰当的选项填进文章中去，你会读到一个有意思的故事。 Do you like pop music? Most people do. One of the best 1 on the music scene is the New Ocean Waves. In the 2 twelve months, they've had three major 3 and made a h...
查看完整题目与答案
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