0.75x=1.83.84
1.8x=0.75×3.84，
1.8x=2.88，
x=1.6．
All these gifts must be mailed immediately _____ in time for Christmas. [ ]
A. in order to have received
B. in order to receive
C. so as to be received
D. so as to be receiving
RJ45型插头和网线有两种连接方法，其中T568B线序为：3、橙白，2、橙，3、绿白，4、蓝，5、蓝白，6、绿，7、棕白，8、棕
