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AIn the liquid-fuel rocket, the purpose of the valves Bis control the flow of the propellants, enabling the engine Cto work at d
AIn the liquid-fuel rocket, the purpose of the valves Bis control the flow of the propellants, enabling the engine Cto work at d
admin
2019-07-01
28
问题
A
In the
liquid-fuel rocket, the purpose of the valves B
is control
the flow of the propellants, enabling the engine C
to work
at different degrees D
of power
.
选项
A、
B、
C、
D、
答案
B
解析
Is control is an incorrect structure. An infinitive is needed after the purpose of the valves is. Correction: is to control.
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