材料题
B
In the fall of 1924 Thomas Wolfe，fresh from his courses in play writing at Harvard joined the eight or ten of us who were teaching English composition in New York University．I had never before seen a man so tall as he，and so ugly．I pitied him and went out of my way to help him with his work and make him feel at home．
His students soon let me know that he had no need of my protectiveness．They spoke of his ability to explain a poem in such a manner as to have them shouting with laughter or struggling to keep back their tears，of his readiness to quote in detail from any poet they could name．
Indeed，his students made so much of his power of observation that I decided to make a little test and see for myself．My chance came one morning when the students were slowly gathering for nine o‘clock classes．
Upon arriving at the university that day，I found Wolfe alone in the large room which served all the English composition teachers as an office．He did not say anything when I asked him to come with me out into the hall，and he only smiled when we reached a classroom door and I told him to enter alone and look around．
He stepped in，remained no more than thirty seconds and then came out．“Tell me what you see．”I said as I took his place in the room，leaving him in the hall with his back to the door．Without the least hesitation and without a single error，he gave the number of seats in the room，pointed out those which were taken by boys and those occupied by girls，named the colors each student was wearing，pointed out the Latin verb written on the blackboard，spoke of the chalk marks which the cleaner had failed to wash from the floor，and pictured in detail the view of Washington Square from the window．
As I rejoined Wolfe，I was speechless with surprise．He，on the contrary，was wholly calm as he said，“The worst thing about it is that I‘ll remember it all．”
Which of the following is NOT said in the passage
把10gMgCl2和MgSO4的混合物溶于适量水中，滴加2mol／L的BaCl2溶液至沉淀完全，共消耗BaCl2溶液25mL。求混合物中MgCl2和MgSO4的质量各是多少克
固定在匀强磁场中的正方形导线框abcd，各边长为1．其中ab是一段电阻为R的均匀电阻丝，其余3边均为电阻可忽略的铜线。磁场的磁感应强度为B，方向垂直纸面向里。现有一与ab段的材料、粗细、长度都相同的电阻丝PQ架在导体框上，如图所示。PQ以恒定速度方向如何
一小物块以速度v0=10m／s沿光滑地面滑行，然后沿光滑曲面上升到顶部水平的高台上，并由高台上飞出，如图所示。问当高台的高度h多大时，小物块飞行的水平距离最大这个距离是多少(g=10m／s2)
某晶体盐的水溶液呈浅绿色，在此溶液中通入氯气，溶液变为棕黄色，把所得棕黄色溶液分成两份：一份加入KSCN溶液，溶液变深红色；另一份加入BaCl2溶液，产生不溶于稀HNO3的白色沉淀，则该晶体盐的化学式是_______。
欲除去乙烷中的乙烯，可将混合气体通过盛有_______的洗气瓶；欲除去乙炔中的硫化氢，可将混合气体通过盛有_______的洗气瓶。
浓硝酸常盛装在棕色瓶中，且贮放在冷暗处，原因是_______，
碳酸氢钠溶液和烧碱溶液反应的离子方程式为_______。
常温下，氨水中存在的离子有_______。
在酸或碱存在的条件下，甲酸甲酯跟水发生水解反应的化学方程式为_______。
有下列几种气体：H2、O2、HCl、NO、NH3、CH4，其中通常情况下能用来和水做“喷泉”实验的是_______。
