袖珍磁强计用来测量()
A.矫顽力的大小
B.磁力的大小
C.保留在工件中剩余磁场的大小
D.漏磁场的小
参考答案:C
Mr. hang didn't_______ at the meeting and nobody knew the reason. [ ]
A.take up
B.come up
C.call up
D.show up
断层走向平行于褶曲轴的叫().
A.横断层;
B.纵断层;
C.斜断层.