（)是机器的运动单元。A．零件B．构件C．机构D．部件

128 On a precedence diagram, the arrow between two boxes is called:

A. An activity.

B. A constraint. C. An event.

D. The critical path.

E. None of above

10 On a precedence diagram, the arrow between two boxes is called:

A. An activity.

B. A constraint.

C. An event.

D. The critical path.

E. None of above

o the first. After this there is a third shape, an arrow and four shapes. Find which of the four shapes goes with the third one to make a pair like the two on the left.

The following diagram denotes dependency between two activities A and B,It says（）

A.B can’t start before A is finished

B.B can’t finish before A is finished

C.B can’t start before A starts

D.B can’t finish before A starts

A、graphically portrays the relationship between two variables.

B、uses interval or ratio scale data.

C、does not allow negative values.

D、both A and B are correct.

This is the Ellingham diagram for oxide formation reactions. In the direction of the red arrow, we can find:

A、Increasing reactivity

B、Decreasing reactivity.

C、Non-sense, reactivity cannot be evaluated.

D、None the above

A、the dependent variable is scaled along the horizontal axis.

B、the independent variable is scaled along the vertical axis.

C、the graph shows the relationship between two variables.

D、the probabilities are plotted.

A、use case diagram

B、class diagram

C、collaboration diagram

D、sequence diagram

Label the diagram below.

Choose your answers from the box and write the letters A-E next to questions 33-37.

A．Cirrus

B．Cumulonimbus

C．Stratus

D．Fog

E．Cumulus

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