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【简答题】
已知函数 ， （Ⅰ）若函数 在 上是减函数，求实数 的取值范围； （Ⅱ）令 ，是否存在实数 ，当 （ 是自然常数）时，函数 的最小值是3，若存在，求出 的值；若不存在，说明理由； （III）当 时，证明：
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举一反三
【单选题】根据下列的汇票记载,可判定记载为( )的汇票为有效汇票。
A.
Pay toTomson Co . out of the proceeds in our No . 3 arcount the sum of three thousand US dollars.
B.
Pay to Tomson Co . the sum of two thousand US dollars.
C.
Pay to Tomson Co . or order the sum of two thousand US dollars and ten books.
D.
Pay to Tomson Co ． the sum of four thousand US dollars upon receipt of Bill of Lading No . 12345.
【单选题】____ the consequences of the chemical leaks, the specialists haven’t given final conclusion before they obtain accurate statistics.
A.
In addition to
B.
As a result of
C.
In spite of
D.
With regard to
【单选题】下图中使用16x4的ROM实现了4变量输入的多个函数Y1、Y2、Y3、Y4,A、B、C、D为函数的输入端,试在下列表达式中选择函数Y1 对应的输入、输出表达式。
A.
Y=A'BC + A'B'C
B.
Y=AB'CD' + BCD'+ A'BCD
C.
Y=ABCD'+ A'BC'D'
D.
Y=A B'CD' + ABCD
【单选题】In chemical sewage treatment system , tests must be performed ___to check the chemical dosage rates .
A.
Monthly
B.
Weekly
C.
Daily
D.
Annually
【单选题】In chemical sewage treatment system, test must be performed ______ to check the dosage rate.
A.
monthly
B.
weekly
C.
daily
D.
annually
【单选题】多个函数Y1、Y2、Y3、Y4使用下图16x4的ROM实现,A、B、C、D分别为函数的输入信号端,试选择函数Y4 的输入、输出表达式。
A.
Y=A'BC + A'B'C
B.
Y=AB'CD' + BCD'+ A'BCD
C.
Y=ABCD'+ A'BC'D'
D.
Y= A' B'CD' + ABCD
【单选题】根据下列的汇票记载,可判定记载为( )的汇票为有效汇票。
A.
Pay to Tomson Co. the sum of five hundred HongKong dollars providing the goods they supply are complied with contract.
B.
Pay to Tomson Co.or order the sum of two thousand US dollars.
C.
Pay to Tomson Co.or order the sum of two thousand US dollars and ten books.
D.
Pay to Tomson Co ． the sum of four thousand US dollars upon receipt of Bill of Lading No.12345.
【多选题】根据下列的汇票记载，可判定记载为（ ）的汇票为有效汇票。
A.
Pay to Tomson Co . or order the sum of two thousand US dollars.
B.
Pay to Tomson Co . the sum of five hundred HongKong dollars providing the goods they supply are complied with contract.
C.
Pay toTomson Co . out of the proceeds in our No . 3 arcount the sum of three thousand US dollars.
D.
Pay to Tomson Co ． the sum of four thousand US dollars upon receipt of Bill of Lading No . 12345.
E.
Pay to Tomson Co . the sum of two thousand US dollars.
F.
Pay to Tomson Co . or order the sum of two thousand US dollars and ten books.
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