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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
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】V-2 missile is a kind of ____ missile.
A.
Air-supported
B.
Air-to-ground
C.
Ground-to-air
D.
Ballistic
【多选题】Navigation could provide information about: ____.
A.
Control
B.
Location
C.
Azimuth
D.
Speed
【单选题】It is preferable to take specimens from groups of ants
A.
A hand collecting
B.
B using bait
C.
C sampling ground litter
D.
D using a pitfall trap