某种商品的进价为800元，出售时标价为1200元，后来由于该商品积压，商店准备打折销售，但要保证利润率不低于5%，则至多可打( )折
7
Charlie is going to have problems finding a job ________ he gets his A levels.[ ]
A. even if
B. now that
C. as though
D. so that
根据《住宅装饰装修工程施工规范》，纸面石膏板安装应符合相应的规定，纸面石膏板周边钉距宜为150-170mm，板中钉距不得大于（）mm。
A.10
B.20
C.30
D.40
