液压举升拖架通过四连杆机构将工作行程放大，具有最低高度低、起升行程大的特点，被广泛用于车辆等的修理和其它流动起重作业。
参考答案：对
有占位性病变，来自牧区与犬有接触史者，应增加的检查为（）
A.磁共振
B.包虫病（棘球蚴病）血清学检查
C.DNA检查
D.PCR检查
E.活体检查
正确的词形填空
小题1:December is the (twelve) month of the year .
小题2:Sony is the ________ (thin ) boy in the class .
小题3:_________(luck), he was not badly hurt.
小题4:The little boy’s (die) made everyone sad.
小题5:This is a _________(please) trip and we all enjoy ourselves.
小题6:The famous ___________ (invent) has invented many useful inventions all his life.
小题7:My grandpa is over 80 , but he is (knowledge).
小题8:They have been to America ___________(one).
小题9:As a ____________(science) , Qian Xuesen worked hard.
小题10:Please keep the window ____ __(close) because the wind is blowing hard.
