提出职业锚理论的学者是()。
A.施恩
B.霍兰德
C.帕森斯
D.卡特尔
参考答案:A
—What's the matter with Tom?
—A letter from his wife ______ an attack of homesickness.[ ]
A. held up
B. reached out
C. picked up
D. set off
数字信号发生器属于()的信号部件。
A.局间信令
B.用户线信令
C.NO.7信令