企业会计中的利润是指企业在一定期间的:()。
A.经营收入
B.经营毛利
C.经营成果
D.经济效益
参考答案:C
在青少年和儿童中,发病率最高的恶性肿瘤是 [ ]
A.肺癌
B.胃癌
C.白血病
D.肝癌
Circuit-switching technology is used in Public Switched Telephone Network (PSTN), Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA). It is a()information transfer mode.
A.connection oriented
B.connectionless
C.high bandwidth utilization
D.poor real-time