妊娠腹痛的发病机理主要是
A.气血虚弱
B.气滞血瘀
C.寒湿凝滞
D.肝郁脾虚
E.胞脉气血运行不畅
参考答案:E
解析:[评析] 多因血虚、虚寒、气郁导致胞脉失养或胞脉阻滞而致。
For a moment nothing happened, then all shouting together.
A.voices had come
B.did voices come
C.voices would come
D.came voices
焊接方法对金属焊接性的影响主要表现在()。
A、焊后热处理
B、坡口形式
C、热源性质和保护方式
D、装配质量