单选题An auxiliary reservoir for starting auxiliary engines should be kept at （）.Alow pressure at all timesBfull pressure at all timesClow pressure at intermittenceDfull pressure at intermittence
单选题
An auxiliary reservoir for starting auxiliary engines should be kept at （）.
A
low pressure at all times
B
full pressure at all times
C
low pressure at intermittence
D
full pressure at intermittence
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