在拉伸法测弹性模量实验中,从望远镜中观察标尺的像,发现上部清楚而下部模糊,这时应调节望远镜的()
A.高低位置
B.调焦手轮
C.水平调节螺丝
D.目镜
参考答案:C
用所给单词的适当形式填空
1. They refused to give any interviews to __________(journal).
2. Edison won his spurs as an __________(invent) while rather young.
3. The piece of bamboo makes a __________(music) sound.
4. My parents are worried about the __________(safe) of me all the time.
5. The air was __________(pollution) by factory smoke.
受者血液中若存在抗供者的抗体,常出现().
A.亚急性排斥反应
B.急性排斥反应
C.慢性排斥反应
D.超急性排斥反应
E.移植物抗宿主反应