-
1mol/L醋酸与2mol/醋酸中H离子的浓度比为？
2009-03-28 10:16 来自版块 -
-
1为什么马铃薯不含还原糖 ？ 2马铃薯不含还原糖 但吃起来有甜味 是由于什么作用3食用马铃薯后消化分解成的葡萄糖，被小肠上皮细胞吸收后发生的代谢变化是？
2008-11-02 18:03 来自版块 -
-
各项均为实数的等比数列｛an｝前n项和记为Sn,若S10=10,S30=70,则s40等于（ ） (n 10 30 为角码）
2008-10-19 11:53 来自版块 -
-
I bought a number of books from the bookshop yesterday.( )most were at a low price. A for which B in which C of which D who... 全文
2008-10-19 11:33 来自版块 -
-
Aunt Li was more than pleased to see the TV program ( ) her daughter acted. A at which B in which C for which D with which
2008-10-19 11:26 来自版块 -
-
Is this hotel ( ) you said we were to stay on the phone last night?A where B the one C in which D that
2008-10-19 11:21 来自版块 -
-
数列an满足a0=1 an=a0+a1+a2+........+an-1 (n>=1)则当n>=1时 an=? (n, 0, 1 , 2, n- 1,为角码）
2008-10-19 11:14 来自版块 -
-
it that 都可以指代事物 如何区分 啊
2008-10-19 10:50 来自版块 -
-
____he was in japan,he visited many places A during B since C while D in
2008-10-19 10:31 来自版块 -
-
____he was in japan,he visited many places A during B since C while D in
2008-10-19 10:30 来自版块 -
-
He ran as fast as he could ( ) the bus A catch B to catch C catching D caught
2008-10-19 09:59 来自版块 -
-
I will come to see you if ( )A you are convenient B it is convenient for you C you feel convenient D it is convenient with you
2008-10-19 09:43 来自版块 -
-
I will come to see you if ( )A you are convenient B it is convenient for you C you feel convenient D it is convenient with you
2008-10-19 09:42 来自版块 -
-
He was nearly drowned once. When was ( ) It was in 1998 ( ) he was in middle schoolA that,that B that,when C it,that... 全文
2008-10-19 09:38 来自版块 -
-
It order not to be disturbed,I spent three hours( ) in my study.A locking B locked C to lock D to be locked
2008-10-19 09:33 来自版块 -
-
已知函数Ｆ（x)是周期为２的函数，当－１＜x<1时，Ｆ（x)=x的平方＋１，当１９＜x<21时,f（x)的解析式是？ 帮忙解下 谢了．
2008-10-13 17:52 来自版块 -
-
偶函数Ｆ（x)定义域为Ｒ，若Ｆ（x)=F(X+1)对一切x属于Ｒ恒成立．由当0小于等于x小于等于1时Ｆ（X)=-(X-1)的平方＋４(1)求证Ｆ（x)呈周期函数为？(2)求当１小于等于x小于等于2时Ｆ（x)的解析式？ 帮忙解下啊 谢了．[ 本帖最后由 teacher2 于 200... 全文
2008-10-13 17:45 来自版块 -
-
在电解水制取H2和O2时，为了增强导电性，常常要加入一些电解质，最好选用下列物质中的（ ）a x是石墨，Ｙ是铜棒 b x y均是铜棒 Ｃ x y均是石墨 ＤX是阴极，Y是阳极
2008-09-23 21:34 来自版块 -
-
设f(x)是Ｒ上的偶函数且f(0)=o,y=g(x)是Ｒ上的奇函数，对于x属于Ｒ都有g(x)=f(x+1),则f(2008)=??? 帮忙解下不胜感激
2008-09-23 21:17 来自版块 -
