采用刺激迷走神经的方法可以纠正的心律失常是A．阵发性室性心动过速B．窦性心动过缓C．窦性心律不齐

A shear Stress of τ_xzis applied to a fluid. The direction of the shear applied is______

A shear Stress of τ_xzis applied to a fluid. The direction of the shear applied is______

A. tension，shear and compression；

B. tension，shear and torsional deformation；

C. .tension，shear and flexural deformation

The average shear stress is defined by, in whichrepresents .

Shear flow is a measure of the force per unit length along a () axis of a beam. This value is found from the () and is used to determine the shear force developed in fasteners and glue that holds the various segments of a beam together.

A、longitudinal, shear formula

B、transverse, shear formula

C、longitudinal, flexure formula

D、transverse, flexure formula

hear flow () to the walls of the member is important. The shear flow varies () along segments that are () the direction of the shear force V.

A、parallel to, linear, perpendicular to

B、perpendicular to, linear, parallel to

C、parallel to, parabolically, perpendicular to

D、perpendicular to, parabolically, parallel to

A．The reciprocal theorem of shear stresses is not valid

B．The reciprocal theorem of shear stresses is right

C．Shear hooke’s law still is right

D．Shear deformation is still elastic deformation

The shear flow in the thin-walled member varies () along the segments that are () or () the direction of the shear force V. On the cross section, the shear "flows" along the segments so that it contributes to the shear force V yet satisfies horizontal and vertical ().

A、parabolically, inclined, parallel to, force equilibrium

B、linearly, inclined, parallel to, force equilibrium

C、linearly, inclined, parallel to, moment equilibrium

D、parabolically, perpendicular to, parallel to, force equilibrium

In section B of the cantilever beam shown,

A、there is a jump in the shear force diagram, and the bending moment diagram is continuous and smooth.

B、there is a sudden slope change in the shear force diagram and jump in the bending moment diagram.

C、there is a jump in both the shear force diagram and the bending moment diagram.

D、there is no jump in the shear force diagram, but there is a jump in the bending moment diagram.