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【单选题】
How many days left before the test?A.
three days
B.
two days
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皮皮学刷刷变学霸
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【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】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、减数与差的和是195，减数比差大22.5，减数是（ ）。
【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=______○______．
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