the possible direction of a dimension text should towards?
the "r" and "∅ " means radius and diameter.
the main contents of title block are:
the elements of the dimension
thin dashed dotted line to indicate axis line ,symmetrical center lines.
continuous thin irregular line to indicate part sectional boundary lines or to terminate a part view, and for short break line.
thick dashed line shown can be made surface-treatment
a compass is used to draw circles and arcs
which coordinates are related to h projection of a point?
how can you represent v projection of a point?
which projection accumulates as a point for a h perpendicular line?
which projection is the true length for a frontal line?
how many types of parallel line are there relative to projection plane?
how many relationships between two lines?
if two projections of two lines are parallel, then the two lines are parallel in space
the true length projection of a line appears in a projection plane that is parallel to the line
two lines are parallel in space provided that their respective projections on two projection planes are parallel.
if a line is parallel to any line in a plane, the line is parallel to the plane.
what type of intersection line can you get, when a sphere cut by a plane?
known to have four sets of projections of a sphere with a circular hole, the correct set is ( )
known solid’s main view and top view, select correct left view ( )
given the main view and top view of the solid, the correct left view is ( )
according to the main and top views, select the right left view ( )
select the correct left view ( )
select the correct left view ( )
select the correct left view ( )
select the correct top view ( )
select the correct top view ( )
select the correct left view ( )
select the correct left view ( )
select the correct top view ( )
what are the regulations of three views? main view and left view : ; main view and top view: ; top and left view: .
is the dashed line necessary in isometric projection?
how much is the axes angle of isometric projection
longer dimension should be outside of short ones.
the overall length is necessary for a round end plate.
the three types of dimension include shape dimension, location dimension and overall dimension
select the correct view.
select the correct left view ( )
select the correct top view ( )
select the correct top view ( )
how much is the inclined angle of hatching for the commonly used metallic material
an object be represented as local section in the condition that both the outside and inside are complex, and its structure is not symmetry
when several parallel cutting planes are used to cut, there will be a bold line at the corner of turning point.
superposition cut is represented as thick line and is put inside the original view
the arrow head can be omitted when the cut structure is symmetry,
the cut is represented only on the croosection, but the section is represented for all the visible outlines
when a cutting plane pass through symmetric position of a rib, there should be no hatching on the area of the rib.
the position of labeling the name letters for a sectional view should be above its view
when a cutting plane pass through the symmetric position, the labeling location symbols can be omitted.
when a inclined cutting plane is used, the inclined sectional view can be rotated at an angle of less than 45°.
what does lh mean in thread marks?
what does m, tr, r mean respectively in thread marks?
what does the 6 mean in symbol of washer gb/t 97.1-2002 6
what is the diameter relationship between hole and bolt?
whe two adjacent part are cut, the hatching direction shall be reverese.
in screw joint, the end line should be drawn at the position of
the addendum circle is larger than pitch circle, and the dedendum circle is the allest one
keyway inside a wheel is normally through
in the symbol of key 16x100 gb/t 1096-2003, what does 100 mean?
select the correct thread connection drawing method
when draw internal thread, major diameter is drawn as thin line , minor one is drawn as thick line in non circular view.
in circular view, the notch of screw head should be drawn with an inclind angle of ( )
what is the unit in ra6.3?
what is the most commonly used evaluation parameter of surface roughness
how much is the upper deviation of h6
what is the fit of h7/f6?
in hole based system of fit, what is the basic devitaion symmbol of the hole
what principle does one should follow in set position of a part?
the dimension chain should be closed
when represent a shaft, the non-circular view should be chosen as main view
the upper deviation is : maximum size-basic size and the lower deviation is : minimum size-basic size
we can find the material from title block
the contents of assembly drawings
necessary dimensions include:
inside the block,you should sign your name and object name
overall dimensions show the ( ) of the composite solid
technical requirements on a detail drawing include surface texture, dimension tolerance, geometrical tolerance, heat treatment and surface treatment, machining and inspection, and other special requirements
when two part's surface contacting, there had better be only one pair of contact surfaces in the same direction