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Unit Two : Ensure Subject
and Verb Agreement
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: A number of innovative
developments ( has , have ) been
made in the multi-componentinjection molding process in
recent
years.
:have
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: A gas channel design that ( guides ,
guide ) the gas flow to the desired
locations ( is , are ) one of the keyfactors that determine a
successful
application.
: guides, is
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: The delay time along with gas
injection points ( is , are ) importantin producing
injection-molded parts
of quality.
:is
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: Neither the processing
parameters nor the amount of
polymer melt injection solely( determine , determines ) a
successful gas channel design.
: determines
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: To select the number and locations
of gas injection points and todetermine the amount of
polymer
melt injection ( is , are ) essential
to a successful application.
: are
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: Ergonomics ( aim , aims ) to
integrate worker comfort and
productivity.
: aims
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: Each of the factors ( contribute ,
contributes ) to a successful design.
: contributes
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: The simulation in which the
polymer melt flow ( occurs , occur )in thin cavities ( provides
, provide )
accurate predictions.
: occurs, provides
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: Establishing a general model or
empirical formula in addition to
describing the thickness variation of theskin melt that exists
between the
gas/melt interface and the cavity wall
( appear , appears ) to be necessary for
further development.
: appears
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: The number of gas injection points
( are , is ) important in producing
quality injection-molded parts.
: is
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