what+is+his+name对不对

@从莺4824:硫与热的浓NaOH溶液反应的化学方程式为3S+6NaOH 2Na 2 S+Na 2 SO 3 +3H 2 O.当有1mol硫发生反应时, -
饶于15149901254…… C 生成Na 2 S,单质硫被还原,当有3mol硫反应时生成2molNa 2 S,即有 的硫被还原.所以,当1mol硫反应时,应生成 molNa 2 S,被还原的硫即为 mol.

@从莺4824:cosa+cos2a+cos3a+...+cosna=? - 作业帮
饶于15149901254…… [答案] 符号较多,难以打出,这里指一个思路,详细自己计算. 作A=cosa+cos2a+cos3a+...+cosna, iB=isina+isin2a+isin3a+...+isinna,其中i为虚数单位.利用欧拉公式 则A+iB=e^(ia)+e^(i2a)+...+e^(ina),利用等比数列求和将e^(ia)+e^(i2a)+...+e^(ina)的和求...

@从莺4824:...up his job security and salsry in an international information business to risk starting his own business.A.that B.which C.it D.what4.To put___simply,she is not ... - 作业帮
饶于15149901254…… [答案] 1.Why are you naking[making] so much noise ?I just cant't help___.A.so B.that C.this D.it Why are you making so much noise ... A.that B.which C.it D.what He thought [D] it was wise to give up his job security and salsry in an international information ...

@从莺4824:What surprised me most was that he told me his na -
饶于15149901254…… who是指一个人的身份,what is your father就是指你父亲做什么的,what is he他是做什么的 变成疑问句

@从莺4824:小学语法知识 比如 be+动词ing等 - 作业帮
饶于15149901254…… [答案] 【小学英语语法知识点汇总】 1.人称代词 主格:I we you she he it they 宾格:me us you her him it them 形容词性物主代词:my our your her his its their 名词性物主代词:mine ours yours hers his its theirs 2.形容词和副词的比较级 (1) 一般在形容词或...

@从莺4824:下列各组离子中,能在溶液中大量共存的是( ) - 作业帮
饶于15149901254…… [选项] A. Na+、Cu2+、Cl-、OH- B. H+、Ca2+、CO32-、NO3- C. Ba2+、H+、SO42-、NO3- D. Na+、CO32-、OH-、K+

@从莺4824:动词+sb.+介词+the+身体某一部位是什么意思 -
饶于15149901254…… 表示一人触碰别人某部位. 在句型动词 + sb. + 介词 + the + 身体某一部位中要用the,而不能用人称代词或不定冠词.例如: take sb. by the arm 抓住某人的手臂 hit sb. in the face 打某人的脸 hit sb. on the head 打某人的头 pat sb. on the shoulder ...

@从莺4824:硫与热的浓NaOH溶液反应的化学方程式为3S+6NaOH2Na2S+Na2SO3+3H2O.当有1mol硫发生反应时,被还原的硫有( ) - 作业帮
饶于15149901254…… [选项] A. 0.5mol B. mol C. mol D. 1mol

@从莺4824:(8分)完成下列核反应方程,并指出核反应的类型.① He+ - -------―→ He+ H,是--------变.② Na― -
饶于15149901254…… (1) H 聚 (2) e β衰 (3) H 人工转 (4)0 n 裂 人工核转变是指通过人工技术(射线,激光,粒子撞击等手段)是原子发生反应;衰变是指放射性元素在自然条件下不断的放出粒子的反应,是这种元素的特有性质.天然衰变分为α、β衰变,裂变是重核变为中等质量的核,聚变是轻核变为较重质量的核. ① He+ H―→ He+ H,是聚变; ② Na―→ Mg+ e ,是β衰变; ③ Na+ H―→ Na+ H,是人工转变; ④ U+0 n―→1 Ba+2 Kr+30 n,是裂变.

@从莺4824:硫代硫酸钠与稀盐酸的反应Na2S2O3+2HCl→2NaCl+S↓+SO2↑+H2O在加热条件下加速,原因主要是( ) - 作业帮
饶于15149901254…… [选项] A. 该反应是吸热反应,且可逆,加热使平衡向正向移动 B. 加热促使SO2逸出,使平衡向正向移动 C. 加热促进S2O32-与H+的碰撞,使反应加速 D. 加热促进Na+与Cl-的碰撞,使反应加速

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