During counterflooding to correct a severe list or trim aggravated by an off-center load,a ship suddenly takes a list or trim to the opposite side. You should().
A. continue counterflooding in the same direction
B. continue counterflooding,but in the opposite direction
C. immediately stop counterflooding
D. deballast from the low side
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锅炉定期降粉有利于()
A. 改善煤粉仓的散热条件
B. 给粉机的正常下粉
C. 降低煤粉仓的温度,防止煤粉自燃
D. 制粉出力的提高
供电电压的质量表现方面。正确的是()
A. 电压的闪变
B. 偏离额定值的幅度
C. 电磁波的幅射
D. 供电的可靠性
E. 电压正弦波畸变程度
F. 电压的对称性
功率因数是指在交流电路中,电压与电流之间的相位差的(),用字母()表示。