以下对于网络营销概念的理解正确的是
A. 体现了生态思维
B. 突出人的核心地位
C. 强调了顾客价值
D. 延续了网络营销的系统性
以下不是光固化复合树脂修复适应证( )
A. 中龋
B. 氟斑牙
C. 前牙间隙过宽
D. 残根
______every magnet is surrounded by a magnetic field.
A. It is believed that
B. It believes that
C. It believed that
D. It's believing that
______I have made no arrangements to deal with such cases.
A. It appear that
B. That appears
C. They appear that
D. It appears that