通过粪便检查隐血试验间断阳性可确定哪种疾病（）
A.消化道恶性肿瘤
B.消化道溃疡
C.肠道寄生虫
D.肝脏疾病
E.消化不良
参考答案：B
用所绘单词的适当形式填空。
1. She (cook) dinner every day.
2. Many (leaf) are flying (飞) in the sky.
3. Would you like (open) the door?
4. The boy (sleep), he is very lazy.
5. Is that Lisa (speak)?
在转动中存在的丝杠间隙，可通过自动间补来反馈。
