我国进口税则设置的税率有( )。A．特惠税率 B．协定税率 C．最惠国税率 D．关

根据对话内容,在空白处写出恰当的句子使对话意思连贯完整.所写句子应与所给的标点符号一致.

Mark: (1)                                         ?

Anne: I'm watching my new pen pal's photo.

Mark: Oh,(2)                                         .

Anne: She is from Canada.

Mark: Really?(3)                                         ?

Anne: She lives in Toronto.

Mark: Oh, great.(4)                                         .

Anne: Yes, she does. She has two brothers and two sisters.

Mark: Does she speak English?

Anne: (5)                                         .She speaks it very well.

用照相机照相时，物体在胶卷上形成（　　）

A．缩小的倒立实像

B．放大的正立实像

C．缩小的正立实像

D．缩小的倒立虚像

磨钛合金应选择超硬磨料磨具( )。

A．CBN

B．MBD

C．DMD

A/T伺服马达电源跳开关位于：（）

A、P6

B、P18

C、P61

D、自动油门计算机面板

车轮踏面为什么制成两段斜面？