题目内容

The tourism industry cannot survive unless it

A. promotes ecologically-sustainable activities.
B. ensures that eco-tourism operators are genuine.
C. considers the long-term effects of tourism on physical resources.
D. All of the above.

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对话理解
听力原文：W: What kind of monetary policy instruments may your bank use？
M: They include adjusting the base interest rate, regulating rediscounting and open market operations.
Q: Which of the following wasn't mentioned by the man as a monetary policy？
(11)

A. The minimum deposit reserve.
B. Adjusting the base interest rate.
C. Regulating rediscounting.
D. Open market operations.

常见于各种机床所使用的电动机及轴承齿轮箱的异常现象是()。

A. 输入输出参数异常
B. 振动和噪声
C. 机床转速异常
D. 温升异常

现用0．100 0 mol·L-1NaOH滴定分析浓度为0．100 0 mol·L-1的二元酸H2X。当加入NaOH25 mL时，测得溶液的pH=4．80；当加人NaOH 50 mL时，达到第一化学计量点，溶液的pH值为7．15，试问该二元酸的Ka2值()。

A. 5．62×10-10
B. 3．2×10-10
C. 8．4×10-9
D. 7．1×10-8

将K+沉淀为K2NaCo(NO2)6，沉淀洗涤后溶于酸中，用KMnO4滴定，(NO-2→NO-3，CO3+→CO2+)此时n(K+)：n(MnO-4)是()。

A. 5：1
B. 5：2
C. 10：11
D. 5：11