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【单选题】
Bacterial pili are involved in ( )A.
Adherence to host cells
B.
Motility.
C.
Resistance to heat.
D.
Resistance to phagocytosis.
E.
Endotoxic activity.
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Can
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A.
six weeks
B.
six months
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A.
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A.
A the radio apparatus fitted on the portside
B.
the radio with a portable equipment
C.
the radio equipment which is easily movable
D.
the portable radio with some apparatus
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