降低碱比,将使烧结温度范围()。A、变宽 B、变窄 C、不变 D、二者无关

题型:单项选择题

问题:

降低碱比,将使烧结温度范围()。

A、变宽

B、变窄

C、不变

D、二者无关

考点:化学工程氧化铝生产工艺氧化铝生产工艺题库
题型:单项选择题

根据短文内容,用括号内动词的正确时态形式填空。

     Liu Xiang was born in Shanghai on the 13th of July, 1983. He is 1.88m tall and 1______(weigh) 74

kilograms. He began practicing jumping when he was at Grade Four in primai7 school. He 2______ (win) the

gold medal of the men's 110m hurdles in the 28th Olympic Games. It is the first gold medal that Chinese have

won from this competition in the Olympic history. He 3______(be) a great hero in Chinese eyes since then. He

also likes singing and seeing films. Once when he 4______(walk) in the street, he stopped to answer the

reporter, "I 5______(sing) songs with friends if I feel tired after training, or go to a movie for relaxation."

题型:单项选择题

加装用户的跳接:需要跳().

A.1

B.2

C.3

D.4

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科学家将控制某药物蛋白合成的基因转移到白色来亨鸡的受精卵细胞的DNA中,发育后的雌鸡就能产出含该药物蛋白的鸡蛋,在每一只鸡蛋的蛋清中都含有大量的药物蛋白,而且用这些鸡蛋孵出的鸡,仍能产出含该药物蛋白的鸡蛋。据此分析,下列叙述错误的是[ ]

A.该过程运用了胚胎移植技术

B.这些鸡是转基因工程的动物

C.该种变异属于定向变异

D.这些鸡的变异来源属于基因重组

题型:单项选择题

国内阴极电泳涂装始于20世纪( )。

A.50年代初期

B.60年代中期

C.80年代中期

D.90年代末期

题型:单项选择题

我国法律对驰名商标和一般的注册商标的保护区别主要体现在对驰名商标专用权的保护的范围大于一般的注册商标。 ( )

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