纵向收缩变形即构件焊后在()方向发生的收缩。焊缝的纵向收缩变形量是随()、()的增加而增加,随()的增加而减小。
参考答案:焊缝;焊缝的长度;焊缝熔敷金属截面积;焊件截面积
用所给词的适当形式填空。
1. He (go) to a park yesterday.
2. I (clean) my room last weekend.
3. I usually (wash) my clothes on Sundays.
4. Did you (watch) TV yesterday?
5. Mike (do) his homework yesterday.
去除白细胞和血小板、肝炎病毒和抗A、B抗体的红细胞属于()。
A.浓缩红细胞
B.洗涤红细胞
C.冰冻红细胞
D.LPRBC
E.冷沉淀