下列各项，属于肿瘤的是A．错构瘤B．动脉瘤C．室壁瘤D．骨软骨瘤

根据句子内容及首字母提示，在空白处填入一个适当的单词，使句子意思完整。

     A young boy, about eight years old, wanted to buy a big box of detergent (洗衣粉) in a shop. The

shopkeeper walked over, and (1) a_______ the boy kindly if he had a lot of dirty clothes to wash.

    "No, I don't have any dirty clothes," the boy said. "I'm going to wash my dog."

     But you shouldn't (2) u_______ this to wash your dog. If you wash your dog (3) b____ using this,

he'll get sick. In fact, it might even kill them."

     But the boy didn't listen and carried the detergent to the counter (柜台) and (4) p____ for it, even

though the shopkeeper still (5) t______ to tell him not to use it to wash his dog.

     About a week (6) l______ the boy came back to the shop to buy some candies. The shopkeeper

asked the boy (7) h______ his dog was doing.

     "Oh, he died," the boy said.

     The shopkeeper said he was (8) s_______ that the dog died and added,"I tried to tell you not to use

the detergent on your dog."

     "Well," the boy replied, "I didn't think it was the detergent that (9) k______ him."

     "Oh? (10) W_______ was it then?"

     "I thought it was the spin dryer (甩干机)!"

已知等腰三角形的两条边长分别是7和3，则下列四个数中，第三条边的长是（　　）

A．8

B．7

C．4

D．3

广州工艺品进出口公司委托香港工艺品进出口公司进口装饰花篮一批，经营单位应填报“香港工艺品进出口公司”。

对模型材料的性能要求，以下错误的是（）

A.有良好的流动性、可塑性

B.有适当的凝固时间，一般30～60分钟为宜

C.精确度高

D.压缩强度大，表面硬度高

E.可与印模材料发生化学反应

某化工厂进行机电设备安装工程，主要是锅炉安装、空调安装和电线、电缆的安装工程。工程要求十分严格，部分设备要求采用优质磷素结构钢，锅炉采用耐高温材料，空调通风管道采用绝热材料，电线导管用防腐的塑料制品，电线采用BX或BV型，电缆采用VLV32或VV32型。安装完经检验合格后，交付使用。

主要用于建筑管道、电线导管、化工耐腐蚀零件及热交换器的防腐材料是（）。

A．陶瓷制品

B．橡胶制

C．玻璃钢及其制

D．塑料制品