型号为QL2x80D的启闭机属于()
A、螺杆式启闭机
B、液压式启闭机
C、卷扬式启闭机
D、移动式启闭机
参考答案:A
属于艾滋病的高危人群是()
A.男同性恋者
B.性乱交者
C.静脉药瘾者
D.多次输血者
E.血友病患者
用when或 while填空
1. we were talking in the classroom, the teacher came in.
2. they got to the airport, it was raining.
3. she was reading a book,the phone rang.
4. I saw the boy, he was wearing a new coat.
5. he was reading,he fell asleep.