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【单选题】
Sara kept the secret to ________ and nobody knew about it.
A.
hers
B.
her
C.
herself
D.
she
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【简答题】不定代词填空 My flatmate has eaten __________! There’s nothing left for me.
【简答题】My flatmate has eaten ____! There's nothing left for me.
【单选题】在PWM逆变电路的相电压正弦波调制信号中叠加适当的3次谐波,使之成为马鞍形波的目的在于( )
A.
消除谐波分量
B.
包含幅值更大的基波分量
C.
减少开关次数
D.
削弱直流分量
【简答题】有一个不带电、开有小孔的绝缘金属球壳。将一个带正电的灯草小球放入金属壳内与内层壳接触,则金属壳内层为____电荷。(选填“正”或“负”或“不带”)
【单选题】My flatmate is very good. The dishwasher is broken so every night he does the ______.
A.
washing down
B.
washing over
C.
washing up
D.
washing on
【简答题】everyone someone everything something nothing everywhere nowhere no one My flatmate has eaten __________! There’s nothing left for me.
【简答题】有一个不带电、开有小孔的绝缘金属壳,将一个带正电的灯草小球放入金属壳内并与其接触后将小球移出,再将金属壳接地,金属壳上的内层是______电荷。(选填“正”或“负”或“不带”)
【简答题】有一个不带电、开有小孔的绝缘金属壳,将一个带正电的灯草小球放入金属壳内而不与其接触,金属壳内层为____电荷,外层为______电荷(选填“正”或“负”或“不带”)。
【简答题】语法单选题 19.My flatmate has eaten ( ) . There’s nothing ( ) for me.A. something, leave B. everything, live C. A. everything,left
【简答题】有一个不带电、开有小孔的绝缘金属球壳。 将一个带正电的灯草小球放入金属壳内与内层壳接触,则 金属壳内层为____电荷,外层为______电荷(选填“正”或“负”或“不带”)。
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