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【简答题】
用下列选项来填空： A．南方古猿B．能人C．直立人D． (1)最早直立行走的是_______。 (2)直立行走的姿态与现代人相同的是_______。 (3)最早使用天然火的是_______。 (4)最早进行人工取火的是_________。 (5)不能制造工具的是_______。 (6)出现语言的是_______。 (7)脑容量达到现代人大小的是_______ 。
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【单选题】采用 方法不能改善螺纹牙受力不均匀程度。
A.
增加旋合圈数
B.
悬置螺母
C.
内斜螺母
D.
钢丝螺套
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【单选题】//--------------cnt_full-------------- always @(posedge clk or negedge rst_n) begin if(!rst_n) cnt_full <= 1'b0; else if(___________) cnt_full <=1'b1; else cnt_full <=1'b0; end //-------------------...
A.
cnt == 100000
B.
cnt == 1000000
C.
cnt = 1000000
D.
cnt = 100000
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【单选题】It’s easy for some women to be ________ by products promising to help lose weight soon.
A.
brought in
B.
brought up
C.
taken on
D.
taken in
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【简答题】It's easy to lose sight of _______
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【单选题】__________ usually results in a water shortage that seriously interferes with干涉,妨碍 human activity. Its seriousness depends on the degree of the water shortage, size of area affected, and the duration持...
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volcano
B.
earthquake
C.
hurricanes
D.
drought
E.
tsunami
F.
floods
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【单选题】在以下方法中，____不能够改善螺母的各螺纹之间载荷分布不均匀现象。
A.
增加螺母圈数
B.
把螺母结构做成受拉的悬置螺母
C.
采用钢丝螺套
D.
采用内斜螺母
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【单选题】__________ are caused by a sudden shift/movement deep under ground in the Earth ’ s tectonic 地壳构造的 plates. On the surface, we see this as the shaking of the ground, causing damage to poorly built stru...
A.
volcano
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earthquakes
C.
hurricanes
D.
drought
E.
tsunami
F.
floods
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【单选题】__________ are caused by a sudden shift/movement deep under ground in the Earth’s tectonic地壳构造的 plates. On the surface, we see this as the shaking of the ground, causing damage to poorly built structu...
A.
volcano
B.
earthquake
C.
hurricanes
D.
drought
E.
tsunami
F.
floods
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【简答题】Women are easy to be _______ by the products claiming to help them lose weight in a week. A．taken back B．taken away C．taken in D．taken out
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【判断题】预防车螺纹时产生乱扣的方法 1 、采用正反车法来退刀,即在第一次行程结束时,不提起开合螺母,把刀沿径向退出后,将主轴反转,使车刀沿纵向退回,再进行第二次行程,这样往复过程中,因主轴、丝杠和刀架之间的传动没有分离过,车刀始终在原来的螺旋槽中,就不会出现乱扣。 2 、对于车削车床丝杠螺距与工件螺距比值成整倍数的螺纹。 3 、工件和丝杠都在旋转,提起开合螺母后,至少要等丝杠转过一转,才能重新合上开合螺母...
A.
正确
B.
错误
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相关题目：
【单选题】采用 方法不能改善螺纹牙受力不均匀程度。
A.
增加旋合圈数
B.
悬置螺母
C.
内斜螺母
D.
钢丝螺套
查看完整题目与答案
【单选题】//--------------cnt_full-------------- always @(posedge clk or negedge rst_n) begin if(!rst_n) cnt_full <= 1'b0; else if(___________) cnt_full <=1'b1; else cnt_full <=1'b0; end //-------------------...
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【单选题】It’s easy for some women to be ________ by products promising to help lose weight soon.
A.
brought in
B.
brought up
C.
taken on
D.
taken in
查看完整题目与答案
【简答题】It's easy to lose sight of _______
查看完整题目与答案
【单选题】__________ usually results in a water shortage that seriously interferes with干涉,妨碍 human activity. Its seriousness depends on the degree of the water shortage, size of area affected, and the duration持...
A.
volcano
B.
earthquake
C.
hurricanes
D.
drought
E.
tsunami
F.
floods
查看完整题目与答案
【单选题】在以下方法中，____不能够改善螺母的各螺纹之间载荷分布不均匀现象。
A.
增加螺母圈数
B.
把螺母结构做成受拉的悬置螺母
C.
采用钢丝螺套
D.
采用内斜螺母
查看完整题目与答案
【单选题】__________ are caused by a sudden shift/movement deep under ground in the Earth ’ s tectonic 地壳构造的 plates. On the surface, we see this as the shaking of the ground, causing damage to poorly built stru...
A.
volcano
B.
earthquakes
C.
hurricanes
D.
drought
E.
tsunami
F.
floods
查看完整题目与答案
【单选题】__________ are caused by a sudden shift/movement deep under ground in the Earth’s tectonic地壳构造的 plates. On the surface, we see this as the shaking of the ground, causing damage to poorly built structu...
A.
volcano
B.
earthquake
C.
hurricanes
D.
drought
E.
tsunami
F.
floods
查看完整题目与答案
【简答题】Women are easy to be _______ by the products claiming to help them lose weight in a week. A．taken back B．taken away C．taken in D．taken out
查看完整题目与答案
【判断题】预防车螺纹时产生乱扣的方法 1 、采用正反车法来退刀,即在第一次行程结束时,不提起开合螺母,把刀沿径向退出后,将主轴反转,使车刀沿纵向退回,再进行第二次行程,这样往复过程中,因主轴、丝杠和刀架之间的传动没有分离过,车刀始终在原来的螺旋槽中,就不会出现乱扣。 2 、对于车削车床丝杠螺距与工件螺距比值成整倍数的螺纹。 3 、工件和丝杠都在旋转,提起开合螺母后,至少要等丝杠转过一转,才能重新合上开合螺母...
A.
正确
B.
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查看完整题目与答案