气焊铸铁,()是强烈促进石墨化的元素,所以必须保正焊缝中有一定的含量。
A.铜和镁
B.铜和锰
C.碳和硅
参考答案:C
One day a dentist was starting his morning work. Suddenly a man ran in. His face was red and he could only say “Quick! Quick!” The dentist thought he must be very ill. His assistant helped to make the poor man sit in a chair. The dentist gave the man some medicine to make him sleep. Then, he looked into the man’s mouth and pulled out all the bad teeth. As soon as the man woke up, he said in a low voice, “Quick, doctor, quick.”
“It’s all right now,” the dentist told him. “It’s over.”
“You don’t understand,” said the man, “I came to tell you your house is on fire.”
根据短文内容,判断下列句子正(T)误(F)。
( )1.The story took place (发生) in the afternoon.
( )2.When the man ran in, the dentist thought he must be ill.
( )3.The man went to sleep after he took some medicine.
( )4.The dentist pulled all the teeth out of the man’s mouth.
( )5.The man ran in to tell the dentist that his house was on fire.
材料1 1961年苏联和美国等西方国家因柏林问题关系紧张。苏联首先展开了行动。8月13日,赫鲁晓夫先是以华约缔约国政府的名义发表声明,建议东德在西柏林墙国界“可靠地堵塞对社会主义阵营各国进行破坏活动的道路”,“在西柏林墙全境四周实行可靠的防卫和有效地监视”。当天午夜,东德派军队和警察占据了东西柏林分界线东柏林一侧的绝大部分过境点,拆毁了街道,设置了路障和铁丝网。到8月17日,一道混凝土墙建筑完毕。这样东西柏林的分界线就给封锁住了,只留下9个由军队把守的出入口。这一地区形势顿时紧张起来。 材料2 普京明确承认美国的全球支配地位。这是叶利钦以及前外长普里马科夫难以做到的事情。普京解释说,这种支配地位只是一种地缘政治现实。俄罗斯单方面决定大幅削减核武器,进一步裁减和重组常规部队,取消设在古巴洛尔德斯的情报收集中心和越南金兰湾的军事基地。普京借此向布什表明,它最终退出了俄美虚拟竞赛。为了实现现代化,俄美必须接触。 比较冷战时期苏联与冷战后俄罗斯同西方国家的关系有何不同。