【单选题】在蛋白质溶液中加入浓碱和硫酸铜溶液显紫红色,这是
【简答题】阅读下面的诗段,完成诗后习题 (一) 君不见黄河之水天上来,奔流到海不复回。 君不见高堂明镜悲白发,朝如青丝暮成雪。 人生得意须尽欢,莫使金空对月。 天生我材必有用,千金散尽还复来。 烹羊宰牛且为乐,会须一饮三百杯 。 把诗句 “天生我材必有用,千金散尽还复来”翻译成现代汉语。
【单选题】From the description in the passage, we learn that
A.
monkeys are also susceptible to HIV.
B.
ADS has killed 25 million people in the last 25 years.
C.
vaccine has been developed to prevent AIDS.
D.
AIDS can be cured by drug cocktails.
【简答题】某制衣厂本周计划每日产100套西服,由于工人实行轮休,每日上班人数不一定相等,每日实际生产量与计划量相比情况如下表(增加的套数为正,减少的套数为负): 星 期 一 二 三 四 五 增 减 +7 -3 +4 -2 -5 问: ①生产量最少的是星期几?生产量是多少? ②本周实际生产总量是多少?
【单选题】From the text we can learn that .
A.
the city of Urumqi has been officially built by Qing troops in 1763.
B.
the city of Dihua has been peacefully liberated by PLA soilders in 1949.
C.
the province of Xinjiang was established in 1884 and the city of Urumqi was named Dihua as the capital city.
【单选题】From the description in the passage, we learn that
A.
monkeys are also susceptible to HIV.
B.
AIDS has killed 25 million people in the last 25 years.
C.
vaccine has been developed to prevent aids.
D.
AIDS can be cured by drug cocktails.
【简答题】证明:u=x 2 -y 2 和都是调和函数,但是u+iv不是解析函数.
【单选题】From the beginning of the passage, we learn that
A.
Virginius had no faith in Chivalry.
B.
Virginius was taught to esteem women.
C.
Victoria was born of an aristocrat family.
D.
Victoria's father was a planter.
【多选题】观看了视频,你对老师有什么印象?(答题指引:赞美之词越多越好,你懂得)
【判断题】函数 和 都调和函数,但 不是解析函数.