下列哪项不能做牙龈切除术（） A.牙龈组织增生肥大 B.骨上袋的慢性脓肿 C.后牙附

假定在SiO₂中加入训(Na₂O)=10%的Na₂O，请计算氧与硅之比值。如果ω(O):ω(Si)≤2.5是玻璃化趋势的判据，则形成玻璃化的Na₂O最大量是多少

对于急性盆腔炎的病理，下列哪些恰当（）

A.急性盆腔结缔组织炎

B.急性子宫内膜炎

C.输卵管积水

D.输卵管卵巢囊肿

E.急性盆腔腹膜炎

TCP/IP协议规定，每个IP地址由（　）（NETID）和主机地址（HOSTID）两部分组成。

A．域名地址

B．链接地址

C．路径地址

D．网络地址

含盐率为5%．的盐水中，盐与水的重量比为1．：20．______．（判断对错）

After inventing dynamites(炸药), Swedish-born Alfred Nobel became a very rich man. However, he foresaw its universally destructive powers too late. Nobel preferred not to be remembered as the inventor of dynamite, so in 1895, just two weeks before his death, he created a fund to be used for awarding prizes to people who had made worthwhile contributions to mankind. Originally there were five awards: literature, physics, chemistry, medicine, and peace. Economics was added in 1968, just sixty-seven years after the first awards ceremony.

Nobel’s original legacy of nine million dollars was invested, and the interest on this sum is used for the awards which vary from $ 30,000 to $125,000.

Every year on December 10, the anniversary of Nobel’s death, the awards (gold medal, illuminated diploma, and money) are presented to the winners. Sometimes politics plays an important role in the judges’ decision. Americans have won numerous science awards, but relatively few literature prizes.

No awards were presented from 1940 to 1942 at the beginning of World War II. Some people have won two prizes, but this is rare; others have shared their prizes.

1. What did the first award ceremony take place?

A. 1895.           B. 1901.             C. 1962.                 D. 1968.

2. The Nobel prize was established to ________.

A. honor the inventor of dynamite       B. recognize worthwhile contributions to humanity

C. resolve political differences        D. spend money

3. In which area have Americans received the most awards?

A. Literature.         B. Economics.          C. Peace.             D. Science.

4. Which of the following statement is NOT true?

A. Awards vary in money value.

B. Ceremonies are held on December 10 to commemorate Nobel’s invention.

C. Politics can be of importance in selecting the winners.

D. A few individuals have won two awards.