单线制是指靠车体的金属部分代替一部分导线的连接方式。
参考答案:对
看图完成对话或句子。
1. —What did you do last weekend, Tom?
—I went to the with my friends.
2. —What is the girl doing?
—Look ! She is _ .
3. Today the weather is . Let's go outside to play soccer.
4. I climbed the _ last week.
5. I had a talk with Lucy on the last week.
冷沉淀中,纤维蛋白原质量要求为()。
A.≥80mg/袋
B.≥100mg/袋
C.≥120mg/袋
D.≥150mg/袋
E.≥250mg袋