下列关于实型常量书写正确的是( )。A．E4 B．3.4e8 C．1.8E0.6

短文填词。

     Li Lei gets an E-mail  f __1__ Jack Wilson. Jack is a high school student from Canada. He wants to  

 l __2__ Chinese.

Dear friend,

     My name is Jack Wilson. I am from Toronto, C__3__. I am 13 years old. I am a schoolboy. I know

  China is a great c__4__. I want to m __5__ friends in China to learn Chinese.

     There are nineteen students in my class. My c __6__ are from six countries. They are learning English.

  My parents are from France. They speak F__7__. There are many Chinese h __8__ in Toronto. I want

 to learn Chinese, b __9__ I don't have any Chinese textbooks. Could you h __10__ me?

     Please write to me soon. Thank you.

                                                                                                                                     Jack Wilson

△ABC在方格纸中的位置如图所示，方格纸中的每个小正方形的边长为1个单位，将△ABC向下平移8个单位后得到△A₁B₁C₁．请你再图中画出△A₁B₁C₁，并写出△A₁B₁C₁各顶点的坐标．

设函数f（x）=-x²+2x+a（0≤x≤3，a≠0）的最大值为m，最小值为n．

（1）求m，n的值（用a表示）．

（2）若角θ的终边经过点P（m-1，n+3），求sinθ+cosθ+tanθ的值．

浸涂成型机组

细菌性痢疾通常属于哪一类炎症()

A．纤维素性炎症

B．化脓性炎症

C．卡他性炎症

D．浆液性炎症

E．出血性炎症