无论是低励失磁还是完全失磁，发电机端测量阻抗最终都会落入（）内。
A.临界失步阻抗圆
B.异步运行阻抗圆
C.临界电压阻抗圆
D.等有功阻抗圆
参考答案：B
胃癌的最常见的转移途径是（）.
A.直接转移
B.血行转移
C.淋巴转移
D.腹腔内种植
E.胃肠道播散
—What do you think of Spain?
—Well, considering its diverse cultures, it is an attractive country,______ worthy of a visit.
A．it
B．one
C．this
D．that
