化简:(aa-2-aa+2)•a2-4a.

题型:解答题

问题:

化简:(
a
a-2
-
a
a+2
)•
a2-4
a
考点:分式的加减乘除混合运算及分式的化简
题型:解答题

人参组织中有( )

A.乳汁管
B.分泌道
C.油室
D.油细胞
E.腺鳞

题型:解答题

The Customs surveillance zone include following places except ______.

A.Any seaport, railway and high way station, airport, border pass or international postal matter exchange where there is a Customs establishment
B.any place where Customs control is conducted
C.any place without a Customs establishment but which has been approved by the state council as a point of entry and exit
D.any place along the border of the country

题型:解答题

某患者虚劳疾,症见身形寒热,手心发热,口中燥渴,神疲食少,舌淡脉虚。

首先考虑不被选用的方剂是()。

A.炙甘草汤

B.温经汤

C.小建中汤

D.大补阴丸

E.当归补血汤

题型:解答题

以下选项中,( )为螺杆式制冷压缩机的供油方式。

A.润滑油喷射润滑
B.压力供油润滑
C.离心供油润滑
D.飞溅润滑

题型:解答题

在没有外界任何刺激作用的情况下,出现无中生有的知觉,就是()

A.动觉

B.错觉

C.幻觉

D.静觉

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