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【简答题】
水质调节的基本方法有___和___调节两种。
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【单选题】已知空间两点A（4，a，-b），B（a，a，2），则向量 AB =（ ）
A.
（a-4，0，2+b）
B.
（4-a，0，-b-2）
C.
（0，a-4，2+b）
D.
（a-4，0，-b-2）
【简答题】阅读理解。 Wei Hua had a busy day yesterday. She got up before 7 o'clock in the morning, and quickly washed her hands and face. She got to school early. She had a little rest after lunch, but worked hard i...
【简答题】阅读填空。 Americans usually eat three l a day. Breakfast usually comes before eight o'clock in the morning. They usually have eggs, some meat, bread, fruit juice and coffee. Lunch is 2 twelve and one o'cl...
【单选题】People began to count down (倒数): ' _____' just before 12 o'clock on New Year' Eve. [ ]
A.
One, two, three...
B.
First, second, third...
C.
Ten, nine, eight...
【简答题】阅读理解 Americans usually eat three meals a day. Breakfast usually comes before eight o'clock(点钟) in the morning. They usually have eggs, some meat, bread, fruit juice and coffee. Lunch is between(在……之间)...
【简答题】听短文填空。 A__ 1 __ usually eat three meals a day. B__ 2 __ usually c__ 3_ _ before eight o'clock in the m__ 4 __. They usually have eggs, some meat, bread, fruit juice and coffee. Lunch is between t__ 5 ...
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