单项选择题

Liquid hydrogen should be stored in stainless steel tanks with double walls filled with __________.

A．insulation
B．module
C．accessory
D．capsule
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单项选择题
The installation of radar is supposed to keep track of airlines in the __________.
A．velocity
B．proximity
C．terrain
D．vicinity
单项选择题
A careful biological experiment will __________ which factors are attributive to the plants' budding.
A．disperse
B．discern
C．dissipate
D．disregard
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