A.flashing water
B.operating oil
C.flushing water
D.sealing water
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A.faster than dead slow speed
B.slower than dead slow speed
C.with the output of MCR
D.at critical speeds
A.salinity
B.alkalinity
C.acid
D.sanitary
A.should be correctly carried out
B.should correctly be taken place
C.should carded with care
D.must to carry out with great care
A.occurred
B.occurring
C.not happening
D.occur
A.gases
B.paints
C.inhibitors
D.detergent
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