对于出口货物的出口退税，国家税务机关正在简化手续，实施“无纸化管理”，出口企业申报出口退税可以免交“出口收汇核销单”。( )
参考答案：对
某弱酸药在pH =5时的非解离部分为90.9%，其的近似值是（）
A.6
B.5
C.4
D.3
E.2
Li Lei cheered ______ he ______ the football match. [ ]
A. seemed; join
B. as if; took part in
C. looks; took part in
D. as if; join in
