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【多选题】
在交流电网中，由于许多非线性电气设备的投入运行而产生了谐波，关于谐波的危害，在下列表述中哪些是正确的?( )A.
旋转电动机定子中的正序和负序谐波电流，形成反向旋转磁场，使旋转电动机转速持续降低
B.
变压器等电气设备由于过大的谐波电流，而产生附加损耗，从而引起过热，导致绝缘损坏
C.
谐波含量较高的电流能使断路器的开断能力降低
D.
使通信线路产生噪声，甚至造成故障
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【简答题】In addition to class distinctions, there are differences between the English and ourselves ______.
【单选题】In addition to such tactics as sit-ins, young students also added to educate people about the war in Vietnam.
A.
rock 'n'roll music
B.
teach-in
C.
class boycott
D.
"march against fear"
【简答题】In addition to their attributes, objects have methods associated with them, and every object that is an instance of the same class possesses the same methods. Methods associated with objects are ( ...
【单选题】In addition to such tactics as sit-ins, young students also added _______ to educate people about the war in Vietnam.
A.
teach-in.
B.
rock ‘n’ roll music.
C.
class boycott.
D.
“march against fear”.
【单选题】In addition to in-class learning,you should ____ at least 2 hours ____ English every day.
A.
spend...to learn
B.
take... to learn
C.
commit... to learn
D.
cost...to learn
【多选题】《中国药典》2015 年版微生物限度检查法中,可选用的稀释液有
A.
PH7.0无菌氯化钠-蛋白胨缓冲液
B.
PH6.8无菌磷酸盐缓冲液
C.
PH7.6无菌磷酸盐缓冲液
D.
0.9%无菌氯化钠溶液
E.
PH7.0无菌磷酸盐缓冲液
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