【单选题】From the passage, you can tell that people prefer glass fiber cables to copper cables because ______.
A.
glass fiber is less expensive
B.
glass fiber delivers messages directly
C.
glass fiber is more up to date
D.
glass fiber is easier to make
【简答题】关于人脸的高光和阴影区域描述正确的一项是( )A. A.C.I.G为高光区域 B. B.D.E.F.H为阴影区域 C. 人脸的高光和阴影区域根据人脸形状的不同而有所区别 D. A.B.C.I.H为高光区域
【单选题】如图14-12所示,在点电荷q的电场中,选取以q为中心、R为半径的球面上点P处作电势零点,则与点电荷q距离为r的点P’的电势为( ).
【单选题】下列能够表示给予某人8折优惠的是()
A.
allow sb. 20% discount
【单选题】Glass-fiber cables can carry hundreds of telephone conversations simultaneously .
【判断题】快递业务人员应将本区域所有快件派送完毕以后再去进行该区域的收件工作。