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【多选题】
提高交流电弧的稳定性的措施有A.
提高弧焊电源频率
B.
提高电源的空载电压
C.
改善电弧电流的波形
D.
叠加高压电
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举一反三
【单选题】The influence the parents _________ on their children _________ great.
A.
take; are
B.
take; is
C.
have; are
D.
have; is
【单选题】By the time you get back, great changes______ in this area.
A.
will take place
B.
will be taken place
C.
are going to take place
D.
will have taken place
【单选题】Great changes _____ in the village in the past few years. [ ]
A.
took place
B.
take place
C.
will take place
D.
have taken place
【简答题】He felt a great weight ______ (take)off his mind．
【单选题】Prepositions(介词) ____ in the structure of English.
A.
take part
B.
take a great part
C.
play a large part
D.
play many parts
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