2000s
2000s
As a product of the reform, China's export tax rebates system was set up in the ______________ . A: 1980s B: 1970s C: 1990s D: 2000s
As a product of the reform, China's export tax rebates system was set up in the ______________ . A: 1980s B: 1970s C: 1990s D: 2000s
操作冲击电压的标准波形是（）波 A: ±200/2500 μs B: ±250/2500 μs C: ±250/2000 μs D: ±200/2000μs
操作冲击电压的标准波形是（）波 A: ±200/2500 μs B: ±250/2500 μs C: ±250/2000 μs D: ±200/2000μs
2. China launched its export tax rebate system in the _____________. A: 1970s B: 1980s C: 1990s D: 2000s
2. China launched its export tax rebate system in the _____________. A: 1970s B: 1980s C: 1990s D: 2000s
The project, ( ) by the end of 2000, will expand the city's telephone network to cover 1, 000, 000 users.
The project, ( ) by the end of 2000, will expand the city's telephone network to cover 1, 000, 000 users.
中国大学MOOC: On Hollywood’s , there are more than 2000 Star Medals with Hollywood celebrity name.
中国大学MOOC: On Hollywood’s , there are more than 2000 Star Medals with Hollywood celebrity name.
某调频波S(t)=20cos(2000πt+8sin400πt)，信号的带宽为（）
某调频波S(t)=20cos(2000πt+8sin400πt)，信号的带宽为（）
计算题：设聚丙烯为线性粘弹体，其柔量为D（t）=1.2t0.1（GPa）-1（t的单位为s），应力状态如下：δ=0t<0δ=1MPa0≦t≦1000sδ=1.5MPa1000s≦t≦2000s试计算1500s时，该材料的应变值。
计算题：设聚丙烯为线性粘弹体，其柔量为D（t）=1.2t0.1（GPa）-1（t的单位为s），应力状态如下：δ=0t<0δ=1MPa0≦t≦1000sδ=1.5MPa1000s≦t≦2000s试计算1500s时，该材料的应变值。
The 2000’s has been an era of great change in the movie and technology industries, and more change is sure to come quickly.
The 2000’s has been an era of great change in the movie and technology industries, and more change is sure to come quickly.
如果要对信号[img=133x18]1802df8bddd8844.png[/img]进行采样并在接收端进行重建,则最低的取样频率等于_______。 A: 1000rad/s B: 2000 rad/s C: 500 rad/s D: 4000 rad/s
如果要对信号[img=133x18]1802df8bddd8844.png[/img]进行采样并在接收端进行重建,则最低的取样频率等于_______。 A: 1000rad/s B: 2000 rad/s C: 500 rad/s D: 4000 rad/s