硅酸盐水泥,抗硫酸盐水泥的比表面积()。
参考答案:≤350m2/kg
新生儿身体评估一般在出生后何时进行
A.10小时内
B.12小时内
C.16小时内
D.20小时内
E.24小时内
The lesson is easy because there are ______ new words in it.[ ]
A. few
B. little
C. a few
D. a little