右上腹部钙化灶可见于下述哪些疾病()A．肝包虫病钙化 B．肝外胆管阳性结石 C．肝内

家用电热蚊香的加热器部分的主要器件是PCT元件，PCT元件是由钛酸钡等导体材料制成的电阻器，其电阻率ρ与温度t的关系如图所示，由于这种特性，PCT元件具有发热和控温双重功能，对此以下判断正确的是

A．通电后，其电热功率先增大后减小

B．通电后其电热功率先减小后增大

C．当其产生的热量与散发热量相等时，温度保持t₁或t₂不变

D．当其产生的热量与散发热量相等时，温度保持t₁

气单胞菌属与肠杆菌科相鉴别的主要依据是前者为（）

A.氧化酶阴性

B.氧化酶阳性

C.葡萄糖发酵

D.葡萄糖氧化

E.革兰阴性杆菌

以下特点中，不属于银联IC卡的是（）。

A、体积小

B、安全性高

C、存储容量小

D、可脱机交易

私募证券投资基金有哪几种类型？

You work for a company which is going to buy a set of equipment from Germany. You are asked to translate a lot of specifications and instructions within four months, which is impossible. Therefore you decide to advertise for two experienced translators as soon as possible. Write an e-mail to Mr. Max Remington, the Public Relation’s manager. Ask for an advertisement for two translators. (You should use Max @ ge. corn for receiver and P. Wu @ yahoo, com for sender)

1) Explain the reason ;

2) Mention its urgency.

You should write about 100 words.