据光的可逆性原理:从近视眼网膜上反射出的光线是()
A、发散光线
B、会聚光线
C、平行光线
参考答案:B
—Tom is an excellent boy. Everyone likes him.
—Yes, his parents are very of him. [ ]
A. proud
B. afraid
C. nervous
D. clear
以下哪种情况下,不需要人工授权?()
A、退货交易时
B、使用POS进行联机支付时,POS显示“咨询银行”
C、线路或通讯故障,无法联机取得授权
D、进行离线消费交易时