熔融金属内原有的或加入的质点作为晶核的成核过程称为（）。
参考答案：非自发成核
The small victories in the fight against poverty and hunger have helped many people who are in trouble allowing them to maintain dignity.
A．before
B．after
C．for
D．while
一位正常儿童的收缩血压为94mmHg，根据计算公式推算其年龄可能为（）
A.6岁
B.7岁
C.8岁
D.5岁
E.4岁
