所谓短路是相与相之间通过电弧或其它较小阻抗的一种非正常联接。（）
参考答案：对
Millie will be busy this weekend. She _____ watch the game show on TV. [ ]
A. mustn't
B. needn't
C. can't
D. doesn't have to
体格检查（physicalexamination）
