(2). 设 \( (X,Y) \) 为离散型，下列式子中错误的是（ ）。 A: \( \sum\limits_i {\sum\limits_j {p_{ij} } } =1\; \) B: \( \sum\limits_i {p_{i\cdot } } =1\; \) C: \( \sum\limits_j {p_{\cdot j} } =1\; \) D: \( \sum\limits_i {p_{i\cdot } } +\sum\limits_j {p_{\cdot j} } =1\; \)
(2). 设 \( (X,Y) \) 为离散型，下列式子中错误的是（ ）。 A: \( \sum\limits_i {\sum\limits_j {p_{ij} } } =1\; \) B: \( \sum\limits_i {p_{i\cdot } } =1\; \) C: \( \sum\limits_j {p_{\cdot j} } =1\; \) D: \( \sum\limits_i {p_{i\cdot } } +\sum\limits_j {p_{\cdot j} } =1\; \)
运行“LIMITS”
运行“LIMITS”
中国大学MOOC: Speed limits could rise with more people using self-driving cars. When self-driving cars prove they can 6) ______ at higher speed limits, speed limits could be raised.
中国大学MOOC: Speed limits could rise with more people using self-driving cars. When self-driving cars prove they can 6) ______ at higher speed limits, speed limits could be raised.
AutoCAD设置绘图范围的命令是(),若选用metric(公制),默认的绘图范围是() A: LIMITS 12X9 B: LIMITS 420X297 C: LIMITS 297X210 D: ZOOM 420X297
AutoCAD设置绘图范围的命令是(),若选用metric(公制),默认的绘图范围是() A: LIMITS 12X9 B: LIMITS 420X297 C: LIMITS 297X210 D: ZOOM 420X297
Challenge the limits 挑战 _____。（三星）
Challenge the limits 挑战 _____。（三星）
在模型空间中设置了LIMITS后,在图纸空间中就不用设置LIMITS了
在模型空间中设置了LIMITS后,在图纸空间中就不用设置LIMITS了
A scarceresource limits the production or sale of a product or service.
A scarceresource limits the production or sale of a product or service.
Ascarce resource limits the production or sale of a product or service.
Ascarce resource limits the production or sale of a product or service.
设置图形边界的命令是LIMITS。
设置图形边界的命令是LIMITS。
A unified essay stays within the limits of the central idea.
A unified essay stays within the limits of the central idea.