Working space is the region of space a robot can reach , which is also called reach envelope. ( )

A _____ is a cylindrical vehicle that helps astronauts reach space.

There is a space beyond the object that the light cannot reach directly.

A、在物体的另一面有一个光线不能直接到达的地方。
B、物体的另一面有一个光线不能到达的地方。

8.A___________is a cylindrical vehicle that helps astronauts reach space.

The right infrahepatic space is also called the

A、Omental bursa
B、Hepatorenal recess
C、Retrocecal recess
D、Intersigmoid recess
E、Superior duodenel recesses