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【简答题】
已知函数 f(x)= x 2 +x+4 x ，(x＞0) - x 2 -x+4 x ，(x＜0). （1）求证：函数f（x）是偶函数； （2）判断并证明函数f（x）在区间（0，2]上的单调性； （3）根据以上结论猜测f（x）在[-2，0）上的单调性，不需要证明．
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【简答题】Passage One Strange things happen to time when you travel, because the earth is divided into twenty four time zones, one hour apart. You can have days with more than twenty-four hours, and weeks with ...
【简答题】Time Zones（时区） Strange things happen to time when you travel. Because the earth is divided into twenty-four zones one hour apart（相差）.You can have days with more or fewer than twenty-four hours, and we...
【简答题】Fill in the blanks with words chosen from the box below. Change the form when necessary multiple, witness, magify, consecutive, elaborate, consensus, simultaneously, safeguard, acknowledge, ultimately...
【简答题】Strange things happen when you travel, because the earth is divided into twenty-four zones. The time difference between two zones is one hour. You can have days with more than twenty-four hours and da...
【简答题】阅读理解。 Strange things happen when you travel, because the earth is divided into twenty-four zones (分……区). The time difference between two zones is one hour. You can have days with more than twenty-four...
【单选题】Strange things happen to time when you travel, because the earth is divided into twenty-four time zones, one hour apart. You can have days with more or fewer than twenty-four hours, and weeks with mor...
A.
no day really has twenty-four hours
B.
the earth is divided into time zones
C.
time zones are not all the same size
D.
no one knows where time zones begin
【单选题】听力原文： Strange things happen to time when you travel, because the earth is divided into twenty-four time zones, one hour apart. You can have days with more or fewer than twenty-four hours, and weeks wi...
A.
Seven days.
B.
Twenty-four hours.
C.
One hour.
D.
More than seven days.
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