交流绕组在空间互差（）电角度。 A.90° B.120° C.150° D.180°

To a child’s ear, “mother” is magic in any language.

I firmly believe that e        in the world loves his mother

So ________ I. My mother is an ordinary math teacher. She

always works h       , devoted to her job heart and soul.

In fact, she isn’t ________ good health. She has been suffering

from heart disease for many years. Weak t         she is,

she never stops _____________(工作) or gives up hope. I still

remember the day when my mother r           a card of

______________(祝贺) on her achievements from her director.

The card r          “ Thank you for your excellent work. Happy Teachers’ Day to you!” At that moment, I was so moved

that tears came to my eyes. I am p      of my mother.

麻疹黏膜斑出现于（）

A.潜伏期

B.前驱期

C.出疹期

D.恢复期

E.后遗症期

某建筑场地为软黏土场地，采用石灰桩处理，天然土层的承载力特征值为100kPa，压缩模量为4MPa，桩土应力比为3.0，面积置换率为30%，成孔对桩周土挤密效应好，初步设计时，复合土层的压缩模量宜取（）MPa。

A.8.3 

B.7.8 

C.7.0 

D.6.4

在调节器中，比例度越大，系统调节速度越（）稳定性越（）。