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【单选题】
A single collection of ants can generally be used for both taxonomic and ecological purposes
A.
TRUE
B.
FALSE
C.
NOT GIVEN
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【多选题】Electric rocket engines, according to the different ways of accelerating working medium, can be divided into: ____.
A.
Electrothermal propulsion
B.
Electric current propulsion
C.
Electrostatic propulsion
D.
Electromagnetic propulsion
【单选题】V-2 missile is a kind of ____ missile.
A.
Air-supported
B.
Air-to-ground
C.
Ground-to-air
D.
Ballistic
相关题目：
【多选题】Electric rocket engines, according to the different ways of accelerating working medium, can be divided into: ____.
A.
Electrothermal propulsion
B.
Electric current propulsion
C.
Electrostatic propulsion
D.
Electromagnetic propulsion
【单选题】V-2 missile is a kind of ____ missile.
A.
Air-supported
B.
Air-to-ground
C.
Ground-to-air
D.
Ballistic
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