袋袋户口是什么？
参考答案：
指户口从原居住地或学校迁出，户口未迁到新的居住地，而自管户口，把户口放在自己身边
Tom has _____ in the English contest _____ all the students he works the hardest. [ ]
A. come out the first; because
B. come up first; because of
C. come out first; because of
D. come up the first; because
下列不属于夜视器材的发展趋势的是（）。
A.增大探测与识别距离
B.提高分辨率
C.拓宽光谱覆盖范围
D.改进主动红外夜视仪
