当0≤x≤2π时，使得函数y=tanx与Y=cosx都为增函数的x的范围是___

阅读短文并回答问题。

      Look! There are some students sitting in the classroom. They are reading books. The boy on the left

side is Jim. The girl behind him is Sue. Alice is the shortest in the class. She sits in the first row. Who are

they at the back of the classroom? They are Li Lei and Wang Gang. They are taller than others in the class.

Is the girl in the middle Lucy? Yes, she is, and her sister is on her right. They are twins. They are new

students. We like them very much.

1．Are there any students in the classroom?

     _____________________________________________________________________

2．What are they doing?

     _____________________________________________________________________

3．Who is the girl behind Jim?

     _____________________________________________________________________

4．Where are Li Lei and Wang Gang sitting?

     _____________________________________________________________________

5．Why do they sit at the back of the classroom?

     _____________________________________________________________________

女，1岁7个月。数月来面色渐欠红润，易疲乏，越来越不活泼，食欲减退，曾吃过墙皮等，体重不增。该患儿出牙晚（1岁零10天方萌出），至今以流食和半固体食物为主，食谱较窄。一般情况尚可，体重10kg，口唇、甲床、睑结膜苍白，皮肤干燥，心肺无异常发现，肝脾不大。

欲明确诊断，目前最有必要做的检查为（）。

A.血红蛋白

B.血锌

C.血常规

D.镜下红细胞形态观察

E.血清铁

运输工具装卸进出境货物、物品或者上下进出境旅客，应当接受海关监管。货物、物品装卸完毕，运输工具负责人应当向海关递交反映实际装卸情况的交接单据和记录。 ( )

大慢车

粗苯回收率η=1-а2/а1公式中各符号的意义是什么？