Dual-check valve backflow preventer assemblies are difficult for plumbers to remove, test, or replace because they _____.
a. have left-hand threaded connections
b. do not have replaceable valve inserts
c. are installed in very tight spaces
d. are not normally fitted with shutoff valves or test cocks
d. are not normally fitted with shutoff valves or test cocks
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A circuit uses 216.2 watts and draws a current of 1.88 amps. Find the resistance. Express the answer to the nearer hundredth ohm.
and 
Fill in the blank(s) with the appropriate word(s).
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