name date nation displacement speed number notes
name
date
nation
displacement
speed
number
notes
number
number
number
number
text number text unitnum unitnum number text
river-class frigates 1942 uk 1,370 tons 20 knots 151 anti-aircraft
how many tons of displacement does type b have ?
WRB JJ NNS IN NN VBD-AUX NN NN VBD-AUX .
940 tons
select c4 from w where c1 = 'type b'