A .6个;
B .12个;
C .18个;
D .20个
[单选题]火车运来一批原煤数量为200t,按照国标规定最少应采子样数为()个。A . 18B . 6C . 20D . 16
[单选题]一采样单元为160t洗煤,应采子样数为()A .4个;B .6个;C .8个;D .10个
[单选题]在1600t的原煤煤堆上采样,应采子样数为()个A . 96B . 76C . 56D . 116
[单选题]1000t商品原煤,应采子样数为()A .60个;B .30个;C .20个
[单选题]对1440t原煤在皮带上采样,应采子样数为(Aa=28%)()A .72个;B .144个;C .36个;D .288个
[单选题]对1440t原煤在皮带上采样,应采子样数为(Aa=18%)()A .72个;B .144个;C .36个;D .18个
[单选题]对1440t原煤煤堆,应采子样数为()A .144个;B .72个;C .36个;D .60个
[单选题]火车上装180t原煤应采子样数为()A .9个;B .18个;C .30个
[单选题]采集测定全水分的煤样,在煤流中采样时,1000t原煤应采子样数为()A .20个;B .10个;C .30个
[填空题] 不足300t的原煤,至少应采的子样数为()个,对于洗中煤至少应采的子样数为()个。