图示三铰拱，在构件CB上分别作用一力偶M(图3-4a)或力F(图3-4b)。当求铰链A、B、C的约束力时能否将力偶M或为F分别移到构件AC上？为什么？

A. When the Earth was formed.
B. The composition of the Earths interior.
C. Why molten rock is hot.
D. How often a volcano is likely to erupt.

A. 一借一贷
B. 一借多贷
C. 一贷多借
D. 多借多贷

A. To review what students know about volcanic activity.
B. To demonstrate the use of a new measurement device.
C. To explain the answer to an examination question.
D. To provide background for the next reading assignment.

A. Her apartment is too far from the campus.
B. Her apartment needs a lot of repair work.
C. Shes having trouble with the owner of the apartment
D. Her roommate wont share expenses.