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【简答题】
所谓三相对称绕组，是指各相绕组结构参数都（），且在空间互有（）的三相绕组。
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反馈参考答案：
举一反三
【单选题】For deplaning, cabin attendants' duties do not include _____.
A.
informing the passengers of the time for deplaning
B.
telling the passengers how to get some idea of directions and find their way
C.
offering help to those who need it
D.
following the passenger to the door to confirm that all have deplaned
【单选题】The cabin attendants, ______ the pilots, will have a short briefing ( ).
A.
as well as
B.
as long as
C.
as good as
D.
so long as
【单选题】Cabin attendants usually use ________ to make announcements.
A.
PSU system
B.
megaphones
C.
pushcart
D.
PA system
【判断题】某多层钢结构厂房，为一购物中心工程，总建筑面积约21200㎡，主体为三层钢框架结构局部四层，结构安全等级为二级。檐口总高度为19m，框架钢柱为焊接箱型柱，钢梁为焊接H型钢梁，楼面为压型钢板与混凝土叠合楼板，外墙面为压型彩板。主钢构件材质为Q345，檀条采用Q235C型薄壁型钢。主要构件焊接质量等级为二级，本工程施工范围包括钢结构系统的制作与现场安装施工。
请根据背景资料完成以下选项钢构件预拼装所用...
A.
正确
B.
错误
【单选题】Cabin attendants usually use ________ to make announcements.
A.
PA system
B.
PSU system
C.
megaphones
D.
pushcart
【简答题】What do the cabin attendants discuss at the briefing?
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