胃溃疡病人出现哪种现象，应警惕癌变可能A．上腹部疼痛反复发作 B．疼痛有节律性 C．

根据《建筑设计防火规范》（GB50016-2006），闪点大于或等于60℃的液体属＿液体。

A.甲类

B.乙类

C.丙类

D.丁类

A

"In only six clays I lost seven pounds of weight. "
"Two full inches in the first three days!"
These are the kinds of statements used in magazine, newspaper, radio and television ads. , promising new shapes and new looks to those who buy the medicine or the device. The promoters of products say they can shape the legs, slim the face, smooth wrinkles, or in some other ways to add to beauty or desirability.
Often such products are nothing more than money-making things for their promoters. The results they produce are questionable, and some are dangerous to health.
To understand how these products can be legally promoted to the public, it is necessary to understand something of the laws covering their regulation. If the product is a drug, FDA (Food and Drug Administration)can require proof (证明) under the Food, Drug, and Cosmetic Act that is safe and effective before it is put on the market. But if the product is a device, FDA has no authority to require pre-marketing proof of safety or effectiveness. If a product already on the marker is a danger to health, FDA can request the producer or distributor to remove it from the market voluntarily, or it can take legal action, including seizure (查封) of the product.
One notable case a few years ago involved an electrical device called the Relaxacisor, which had been sold for reducing the waistline. The Relaxacisor produced electrical shocks to the body through contact pads. FDA took legal action against the distributor to stop the sale of the device on the grounds that it was dangerous to health and life.
Obviously, most of the devices on the market have never been the subject of court proceedings (法律诉讼), and new devices appear continually. Before buying, it is up to the consumer to judge the safety or effectiveness of such items.

It can be inferred that ads. mentioned in the text are ______.

A．objective

B．costly

C．unreliable

D．illegal

斜齿圆柱齿轮的分度圆应等于（）与齿数的乘积。

A.端面模数

B.法向模数

C.轴向模数

56855（）

A.A

B.B

C.C

D.D

关于日本经济特点的叙述，正确的是______。

A．日本主要依靠自己的资源进行生产
B．日本工业的分布集中在日本海一侧
C．日本农业发达、在国民经济中有重要地位
D．日本工业的布局考虑设在优良港口较多的沿海，原料输入和产品输出方便