【简答题】胰岛素是治疗糖尿病的特效药,可从动物胰腺中提取,也可以通过“工程菌”产生,后者与前者比较最显著的特点是:生产条件();原料来源();价格();产物();废弃物()。
【简答题】先化简,再求值: a a-2 - a-3 a 2 -4 ÷ a+2 a 2 +4a+4 ,其中a=-3.
【简答题】计算: (1)-7+4; (2)22+(-4)+(-2)+4; (3)18-6÷(-3)×(-2); (4)8-(-4)÷2 2 ×3.
【单选题】It is difficult to improve the procedures for fixing wage levels because______.
A.
some industries have no unions
B.
unions are not organized according to industries
C.
only 55 per cent of workers belong to unions
D.
some unions are too powerful
【简答题】化简求值: a 2 +4a+4 a+1 ÷(a-1- 3 a+1 ) ,其中a=3.
【简答题】先化简,再求值 4 x 2 -16 ÷ 2 x-4 + x x+4 ,其中x=3.
【单选题】The countries in the Middle East with abundant oil money have commenced to expand_____industrial investment, boosting the overseas plant orders.
【单选题】蜂王浆之所以可以辅助降低血糖。主要因其含有( ),它是治疗糖尿病的特效药物。