当发生三相短路时电力系统变电所馈电母线上的电压基本保护不变。
参考答案：对
When invited to a formal dinner party, remember to ______ something ______ to the occasion. [ ]
A. put on; fitful
B. dress; suitable
C. have; fit
D. wear; appropriate
下列除何者外，静脉血均汇入门静脉（）.
A.胃
B.肝
C.胰
D.胆囊
E.空肠
