There was still a long way to go. __________ , some progress had been made.Which of the following words cannot be used in the sentence.
A. Yet
B. Nonetheless
C. Nevertheless
Despite
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We have __________ this house and would hate to move.
A. been attach to
B. been attached
C. got attached to
D. got attached
从力学、制造和耗材等方面分析标准椭圆形封头、碟形封头、半球形封头优缺点?
直流电动机的转子又称为电枢,主要是由( )等组成。
A. 电枢铁芯
B. 绕组
C. 换向器
D. 电阻器
直流电动机的电刷主要是( )组成。
A. 机座
B. 由碳-石墨制成导电块的电刷
C. 加压弹簧
D. 刷盒