从100g溶质质量分数为16%的氯化钠溶液中取出50g，则取出的溶液中溶液质量分数为（ ）
A．8%
B．16%
C．1.6%
D．无法确定
答案：B
What is concerning us greatly is ____ the workers held up in that area yesterday will be set free.
A．that
B．what
C．when
D．which
可用于检测外周T细胞总数的CD分子是
A．CD3B．CD8C．CD2D．CD1E．CD4
