高压容器中常用的封头型式有（）。A.平形封头 B.半球形封头 C.椭圆形封头 D.碟

Thank you ever so much for your congratulations and good wishes. I hope I can _____ to them.    [ ]

A. look up    

B. live up      

C. add up      

D. set up

买卖双方以CIF条件成交，若双方在洽商合同时未规定具体的险别，则卖方投保时，只有义务投保最低限度的险别。（）

Oily rags stored in a pile that is open to the atmosphere are a hazard because they may（）.

A.deteriorate and give off noxious gasses

B.spontaneously heat and catch fire

C.attract lice and other vermin and serve as a breeding ground

D.None of the above

小儿急性阑尾炎的特点是（）

A.病原菌多为需氧菌与厌氧菌混合感染

B.多数患儿早期即出现腹泻

C.多数患儿以转移性右下腹痛为主诉

D.因腹痛常辗转不宁，烦躁不安

E.以上均是

家畜有机磷农药中毒应如何解救？其机理是什么？