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- 1设向量a=(3,-4),则与向量a平行的单位向量为=______.
- 2she is ( ) newer comer to ( )cemistry but she has already made some important discoveries.
- 3求英语常见动词的过去分词表.
- 4运载的"载"的读音是前鼻音还是后鼻音?
- 5they (both like还是like both)to watch tv
- 6：Always put yourself in the other's shoes.If that it hurts you,it probably hurts the person too
- 7在氢氧化钠和偏铝酸钠的混合溶液中滴加盐酸至过量过程中所涉及的离子方程式
- 8人的胃液中含有少量的盐酸,胃酸过多时常服用一种叫胃舒平(主要成分是氢氧化铝)的药片,其中反应的原理是
- 9设函数f(x)的一个原函数为e的-x次方,则不定积分∫f(lnx)/x dx=
- 10某工厂生产酒精要求其含水量不超过百分之十,求：用密度计检测产品的含水量指标时,该厂生产的酒精密度