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【简答题】Dear sir or madam, Thank you for your letter of May 12th, i____ us that you are in the m____ for Chinese bicycles. To give you a general idea of goods we are dealing i_____, we are sending you by air...
【简答题】估一估。 293-181≈( ) 402+298≈( ) 482+346≈( ) 786-415≈( ) 2 1 5 0 +9 9 9≈( ) 9 86-2 15≈( )
【简答题】Supply the missing words in the blanks of the following letter. The first letters are given. Dear Sirs, Thank you for your letter of March 6th, 2014, _i_______ for our tape recorders and your desire t...
【简答题】Study the uses of the conjunction "while" in th following sentences and put each into a category listed below. a. during the time that sth is happening b. at the same time as sth is happening c. as lo...
【简答题】（1）、①用肼(N 2 H 4 )为燃料，四氧化二氮做氧化剂，两者反应生成氮气和气态水。 已知：N 2 (g)＋2O 2 (g)＝N 2 O 4 (g) ΔH＝+10.7kJ·mol -1 N 2 H 4 (g)＋O 2 (g)＝N 2 (g)＋2H 2 O(g) ΔH＝-543kJ·mol -1 写出气态肼和N 2 O 4 反应的热化学方程式： 。 ②已知四氧化二氮在大气中或在较高温度下很难...
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