【名词&注释】
文化程度(education level)、分泌物(secretion)、不规则的(irregular)
[单选题]The power factor of an AC generator operating singularly is determined by the_______ .
A. connected load
B. prime mover speed
C. field excitation
D. generator's rated voltage
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举一反三：
[单选题]Modern handheld digital tachometers operated by counting light pulses returned to the unit by
A. the tach generator
B. either the coupling or shaft
C. a small bulb attached to the shaft
D. a piece of reflective tape
[单选题]分娩的先兆是______。
A. 不规则的子宫收缩
B. 阴道有血性分泌物
C. 以上都是
D. 以上都不是
[单选题]船舶消防部署是三副根据______编制的。
A. 职务
B. 爱好
C. 文化程度
D. 船长的口头命令
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