在火车顶部采样,已知品种为筛选煤,Ad=12.56%,车皮数目为5节,则应采取的最少子样数目为()个。
A、15
B、16
C、17
D、18
参考答案:D
They agreed with him, but it didn't mean to _____ him. [ ]
A. believe in
B. believe
C. believing in
D. believes
上腔静脉阻塞综合征主要表现为(),(),(),()。