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A.
B.
C.
D.
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更多“For the element shown, its principal stresses should be ”相关的问题
A、Because newspapers and TV have a larger coverage than weather reports.
B、Because weather reports are merely related to facts while newspapers and TV programs sometimes change even distort facts.
C、Because weather reports are more timely and accurate than public media.
D、Because newspapers and TV sometimes probably have an indirect effect on people’s moral standards but weather reports are unlikely to influence viewers’ morality.
A．Council members should because they spend all the money
B．The company should because it will profit from them
C．Customers should because they reap the profit in the end
D．The organizers should because it is their responsibility
. If the beam length is reduced to one half of its original length, then the deflection at the free end should be 
A、
B、
C、
D、
A、
B、
C、
D、
of bar 
in the mechanism?
A、
B、
C、
D、
Points
and
are any two arbitrary points in a plane figure. At a instant, the velocities of these two points are
and
, respectively; The accelerations of these two points are
and
, respectively. Which of the following equations is correct?
A、
B、
C、
D、
At a instant, the magnitudes of velocities of points
and
in a plane figure are
and
, respectively, and
. Which drawings are impossible for the velocity directions?
A、
B、
C、
D、
In the planar mechanism, the small gear
rotates without slipping on the big fixed gear
. Crank
rotates around point
. Bar
is pin-connected to gear
and bar
. Which statements are correct?
A、The contact point
of the two gears is the instantaneous center for velocities of gear
.
B、Point
is the instantaneous center for velocities of gear
.
C、Point
is the instantaneous center for velocities of bar
.
D、Point
is the instantaneous center for velocities of bar
.
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