轴突本身因细胞体合成蛋白质等物质发生障碍或运输受阻不能得到足够营养而发生的变性和解体()
A.神经元变性
B.沃勒变性
C.轴突变性
D.节段性脱髓鞘
E.神经断裂
参考答案:C
We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
A.twice as hard as;as easy as
B.as twice hard as;as easy
C.twice as hard as;as easy
D.as twice hard;as easy as
振捣泵送混凝土时,振捣时间宜为。()
A.5~10s
B.10~15s
C.15~30s
D.越长越好