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【简答题】
《窦娥冤》中有许多大家所熟知的名句,如【仙 ·点绛唇】中:“满腹闲愁,数年禁受,天知否?天若是知我情由,( )。()
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举一反三
【简答题】Directions: This is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully ...
【单选题】The newly-found slimming drug can successfully suppress appetite because __ 查看材料
A.
C75 made synthetically in the laboratory works effectively on human body
B.
fatty acid sythase is involved in storing excess food intake as fat
C.
C75 inhibits the activity of an enzyme called fatty acid sythase
D.
it increases a hormone called neuropeptide Y in the appetite-control centers of the brain
【简答题】(8分).丙烷燃烧可以通过以下两种途径: 途径I:4.4g丙烷完全燃烧放出热量为a kJ,写出丙烷燃烧的热化学方程式_________ 途径II:等量丙烷按下列反应进行:C 3 H 8 (g) ==C 3 H 6 (g)+ H 2 (g)  ΔH=+b kJ·mol -1 2C 3 H 6 (g)+ 9O 2 (g) ='=' 6CO 2 (g) +6H 2 O(l) ΔH=-c kJ·mol -...
【单选题】竣工图纸折叠后幅面尺寸应以A( )图纸基本尺寸(297mm×210mm)为标准。
A.
4
B.
3
C.
2
D.
1
【简答题】阅读理解。 Having a large waistline can almost double your risk of dying prematurely (过早地) even if your body mass index is within the 'normal' range, according to a new study, over 350,000 people across Eu...
【简答题】被减数、减数、差之和为80,减数与差相等,减数是______.
【单选题】下列热化学方程式或离子方程式中,正确的是 [     ]
A.
甲烷的标准燃烧热△H为-890.3kJ/mol,则甲烷燃烧的热化学方程式可表示为:CH 4 (g)+2O 2 (g)=CO 2 (g)+2H 2 O(g)   △H=-890.3kJ/mol
B.
500℃、30MPa下,将0.5molN 2 (g)和1.5mol H 2 (g)置于密闭容器中充分反应生成NH 3 (g),放热19.3kJ,其热化学方程式为:N 2 (g)+3H 2 (g) 2NH 3 (g)   △H= -38.6kJ/mol C. 向明矾溶液中加入过量的氢氧化钡溶液: D. 用浓盐酸酸化的KMnO 4 溶液与H 2 O 2 反应,证明H 2 O 2 具有还原性:2MnO 4 2- + 6H + + 5H 2 O 2 = 2Mn 2+ + 5O 2 ↑ + 8H 2 O
【简答题】被减数与减数的比是3:2,被减数是减数的______,差是减数的______.
【简答题】被减数=______○______, 减数=______○______.
【单选题】清洗模型表面粉尘,并用( )干燥模型
A.
热风机
B.
鼓风机
C.
吹风机
D.
电扇
E.
嘴吹
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