单项选择题

Which of the following needs is not in the five-type hierarchy of human needs

A、safe needs
B、social needs
C、esteem needs
D、emotional needs

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单项选择题

等音程有三类。（）
A. 对

B. 错

单项选择题

Several possible boundary conditions are often used to solve vean deflection problems. For example, if the beam is supported by a roller or pin, then it is required that the ( ) be zero at these points. If these supports are located at the ends of the beam, the ( ) in the beam must be zero. At the fixed support, the ( ) are both zero.

A．displacement, internal moment, slope and displacement
B．displacement, internal force, slope and displacement
C．slope, internal shear force, slope and displacement
D．slope, internal moment, slope and displacement