决定血液粘度最重要的因素是（）
A.血流切率
B.血细胞比容
C.血管口径
D.温度
E.细胞形态
参考答案：B
—A desktop, together with 100 DVDs, _____ to the kindergarten as a present.
A．has been offered
B．have been offered
C．has offered
D．have offered
瓦斯隧道洞口（）m范围内严禁火源。
