次要责任是指由两方或多方违反法律、法规、标准共同造成事故,责任小的一方负主要责任。
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某复杂电路计算结果是:I2=2A,I3=-3A,这个结果表明()。
A. 电流I2和I3的方向相反
B. 电流I2大于电流I3
C. 电流I3大于电流I2
D. I2是从电源正极流出的电流
You are signing on a deck officer,who will be designated as one of the GMDSS operators,before sailing foreign.Which statement is TRUE().
A. He/she must have an STCW certificate endorsed as“Valid for Service on Vessels Operating in the GMDSS System”
B. He/she must present either an FCC-issued license or a Coast Guard-issued license
C. You must consult the“List of Qualifications”on the reverse of his/her FCC-issued license
D. His/her Merchant Mariners Document must have an added endorsement as “Radio Electronics Officer&rdquo
常见的肠胃不适表现有()
A. 恶心不思饮食
B. 反胃呕吐反酸
C. 两胁涨痛
D. 大便失调
当同步电动机在额定电压下带额定负载运行时,调节励磁电流的大小,可以改变()。
A. 同步电动机的转数
B. 输入电动机的有功功率
C. 输入电动机的无功功率