As we know, blood types A and B cannot receive AB, but AB may receive A or B. Type O can give to any other group; hence it is often called the() donor.
A、general
B、popular
C、universal
D、common
A、general
B、popular
C、universal
D、common
A、A. As an officer on duty, you must know how to adjust derricks. B、B. As a sailor on duty, you must know how to adjust derricks. C、C. As a sailor on duty, you must know how to operate cranes. D、D. As an officer on duty, you must know how to operate cranes.
A、the range of antenna can cover everywhere in the world B、we can know the ship’s exact position C、that the distress alert can be located as soon as possible D、antenna of permanent earth stations may be directed towards fixed points in the sky