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【判断题】
磁通磁路计算时如果存在多个磁动势，可应用叠加原理。( )A.
正确
B.
错误
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】— I promise my daughter ____ get a nice present on her birthday. — I think it will be a big surprise to her. [ ]
A.
must
B.
shall
C.
might
D.
need
【单选题】—I promise that she get a nice present on her birthday. —It will be a big surprise to her.
A.
should
B.
must
C.
would
D.
shall