【简答题】Only in this way can Chinese enterprises improve their competitiveness and avoid being defeated by their foreign after China’s entry into the WTO. A) 只有这个方法才能帮助中国企业去参加竞争,避免在加入世贸组织后被其外国对手所击败。 B)...
【单选题】That children can learn foreign languages better than adults is ______.
【单选题】So long as you work hard enough, a(an) _____ rod can be ground into a needle. (prov.)A.steelB.s
A.
170. So long as you work hard enough, a(an) _____ rod can be ground into a needle. (prov.) A.steel
【单选题】膳食中有很多因素可影响锌的吸收,下面几项能促进锌吸收的因素为().
【简答题】下面是将乙肝病毒控制合成病毒表面主蛋白的基因HBsAg导入巴斯德毕赤酵母菌生产乙肝疫苗的过程及有关资料,请分析回答下列问题。
【资料1】巴斯德毕赤酵母菌是一种甲基营养型酵母菌,能将甲醇作为其唯一碳源,此时AOX1基因受到诱导而表达【5’AOX1和3’AOX1(TT)分别是基因AOX1的启动子和终止子】。
【资料2】巴斯德毕赤酵母菌体内无天然质粒,所以科学家改造出了图1所示的pPIC9K质粒用作...