【单选题】硅二极管的负极管子的外壳是( ),和发电机外壳一起成为发电机的( )。
【判断题】工程机械发电机硅整流器中,有3只正极管子的外壳是二极管的负极,和发电机外壳绝缘,成为发电机输出直流电的正极B+。
【单选题】无论是中国还是在西方,最早研究文学的学科都叫 ( )
【单选题】Single up forward to breast line and spring
A.
Let go the forward to breast line and spring line
B.
Let go the head line and forward spring line
C.
Let go all lines forward except breast line and spring
D.
Let go all lines forward except head line and spring
【单选题】“Single up forward to headline and spring!” means “ ()”.
A.
Unmoor all lines except the headline and forward spring.
B.
Moor all lines except the headline and forward spring.
C.
Hold on all lines except the headline and forward spring.
D.
Let go the headline and forward spring.
【单选题】若 x-3 在实数范围内有意义,则x的取值范围是( )
【单选题】3-x 在实数范围内有意义,则x的取值范围是( )
【简答题】无论在中国还是在西方,最早研究文学的科学都叫 。