Most marine biological sewage treatment plants consist of all the following statements except()
A.aeration tanks
B.settling tanks
C.disinfection agent(消毒剂
D.anaerobic bacteria(厌氧菌)
A.aeration tanks
B.settling tanks
C.disinfection agent(消毒剂
D.anaerobic bacteria(厌氧菌)
In Paragraph 2, the word" legitimate" most probably means ______.
A) lawful
B) biological
C) personal
D) reasonable
A.single phase
B.two phase
C.three phase
D.four phase
The most powerful electric fish produces enough electricity to______.
A.light a large electric motor
B.kill a marine animal
C.drive a small electric motor
D.kill a large fish
A.contract of carriage of goods by sea
B.evidence of contract of carriage of goods by sea
C.contract of carriage of goods by air
D.evidence of contract of carriage of goods by air
A.it has the most beautiful seascape in the world
B.it has the greatest number of islands in the world
C.it has the most diverse and complex marine life in the world
D.it has the longest coast in the world
A.what was formed petroleum
B.that petroleum was formed
C.when petroleum formed
D.petroleum that formed
A.aeration(通风) tanks
B.settling tanks
C.disinfection agent(消毒剂)
D.anaerobic bacteria(厌氧菌)
A.A. contract of carriage of goods by sea
B.B. evidence of contract of carriage of goods by sea
C.C. contract of carriage of goods by air
D.D. evidence of contract of carriage of goods by air
A.length of each stickleback could be measured.
B.parents could be differentiated from the offspring.
C.number of plates on each stickleback could be counted.
D.offspring collected would be genotyped only once.
A.of the diaphragm type
B.of the centrifugal type
C.of the positive displacement type
D.independently driven by electric motor
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