单项选择题

Which of the following does NOT fit the definition of the black hole

A．The black hole is a region of space.
B．The black hole sucks in any object that passes by it.
C．The black hole is visible through an infrared telescope.
D．The black hole has no matter.

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单项选择题

The example of the diesel engine is used in the passage to illustrate that

A．errors in engineering design are unavoidable.
B．the nonscientific component design is primary.
C．mathematics is a necessary part of the study of design.
D．design courses form a part of engineering curricula.

单项选择题

What contributes to random failures in automatic control systems

A．Using too many inexperienced engineers in the field.
B．Attaching too much importance to nonverbal thinking in engineering.
C．Relying too heavily on the role of mathematics in design.
D．Depending very little on verbal mathematical thought.