A beam with rectangular cross section is subjected to pure bending. The normal stress distribution on the cross section should be
A.
B.
C.
D.
- · 有4位网友选择 A,占比50%
- · 有2位网友选择 C,占比25%
- · 有1位网友选择 B,占比12.5%
- · 有1位网友选择 D,占比12.5%
A.
B.
C.
D.
A laser beam can be turned into a ______ weapon.
A.dead
B.deathly
C.dying
D.deadly
A cantilever beam AB with a circular cross section and length L =750 mm supports a load P = 800 N acting at the free end (see fgure). The beam is made of steel with an allowable bending stress of 120 MPa. (a) Determine the required diameter(figure part a) of the beam, considering the effect of the beam's own weight. (b) Repeat part (a) if the beam is hollow with wall thickness(figure part b); compare the cross-sectional areas of the two designs.
A laser beam can be turned into a______ (dead) weapon.
A.
B.
C.
D.
Codes are scanned by ______.
A.the checkout clerk
B.the customers themselves
C.a laser beam of light
D.the cash register
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