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【单选题】
5~13.把直流电源中恒定的电压变换成( )的装置称为直流斩波器。A.
脉动直流电压
B.
可调直流电压
C.
直流电压
D.
可调交流电压
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【简答题】to care for a person or an animal until they are fully grown:______
【单选题】“sow” (to plant seeds on the ground) and “sow” (fully grown female pig )are called()
A.
Homophones
B.
homographs
C.
perfect homonyms
D.
acronyms
【简答题】A fully grown torpedo can give a ______ than a young one.
【简答题】已知 ，其中f具有二阶连续偏导数，求
【简答题】Among almost seven hundred species of bamboo, some are fully grown at less than a foot high, while other can grow three feet in twenty-four hours.
【简答题】being not fully grown or developed
【简答题】a fully-grown person
【单选题】A fully-grown blue whale _____ 110 feet in height and _____ several tons. [ ]
A.
is measured; weighs
B.
measures; weighs
C.
is measured; is weighed
D.
measures; is weighed
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