卫生统计工作的步骤为（） A.统计研究调查、搜集资料、整理资料、分析资料 B.统计资

PTCD是指（）

A.经皮肝穿刺胆管造影

B.经皮肝穿刺胰管造影

C.经皮肝穿刺胆管引流

D.内镜逆行胆管造影

E.经内镜鼻胆管引流术

You look nice        this fur , but I don’t think it looks        everyone.

A． on , nice on

B． in , lovely in

C． in , lovely on

D．in , beautifully on

仿照例句合并句子。

She will smile, you will see she (as soon as)

She will smile as soon as you see her. 

1.  I'll tell you the news. I'll see your teacher.

    __________________________________

2. I'll give you a call. He will come. 

    _____________________________

3.  The child will cry. Her mother will leave. 

    ________________________________

4.  I got home. I called to tell you that. 

    _________________________________

5.  We arrived. We went to the hotel.

    ___________________________________

小雯用在空气中燃烧镁带的实验来探究质量守恒定律：

(1)镁带燃烧的文字表达式为____。

(2)完全燃烧后称量留下固体的质量比反应前镁带的质量还轻，联系实验过程分析，其原因可能有：___________________________；___________________________。

按工作原理分，物位测量仪表可分为（）、（）、（）、（）、（）、（）等类型。