已知等差数列前n项和为Sn.且S13<0,S12>0,则此数列中绝对值最小的项为

题型:选择题

问题:

已知等差数列前n项和为Sn.且S13<0,S12>0,则此数列中绝对值最小的项为(  )

A.第5项

B.第6项

C.第7项

D.第8项

考点:等差数列的前n项和
题型:选择题

单词拼写(10分)

小题1:December is the t_______ month of the year.

小题2:We have an Art F_________ every year.

小题3:Is this your pencil?--- No , John has one like this. Maybe(可能)it’s h______.

小题4:May I borrow your d_________? Mine is at home.

小题5:Doing sports every day is a good h______.

小题6:She can’t go to school. She is too young. She is o______ three years old.

小题7: We have a new school l_______,and many books are in it.

小题8:It’s 7:50 now.Let’s go! We are l______ for school.

小题9:It’s 10 yuan! You buy it at a good p________ .

小题10:I can’t find my l_______ring, I’m very sorry.

题型:选择题

健康成人白细胞正常值为( )

A.(5~10)×10 9/L

B.(4.5~11)×10 9/L

C.(4.5~10)×10 9/L

D.(4~10)×10 9/L

E.(4~11)×10 9/L

题型:选择题

“通因通用”适用于下列哪种病证 ()

A.脾虚泄泻

B.肾虚泄泻

C.食积泄泻

D.寒湿泄泻

E.肠虚滑脱

题型:选择题

废水的过滤流速一般为()。

A.0.2~0.4米/秒

B.0.4~0.7米/秒

C.0.8~1.0米/秒

D.0.2~0.5米/秒

题型:选择题

三相电能计量的接线方式中,A、B、C接线为正相序,那么C、B、A就为逆相序。

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