不定项选择

牛的小肠可分为十二指肠、空肠和回肠三部分，大部分位于右季肋部、右髂部和右腹股沟部

A．错误
B．正确

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多项选择题

There are a few reasons why the government have to get involved in the tourism business, those are
A、Tourism is an importance source of foreign exchange earnings and they are important for a country’s balance of payments
B、Employment creation and need to provide education and training
C、Tourism is a large and fragmented industry requiring careful coordination of development and marketing
D、The need to maximise the net benefits to the host community

单项选择题

流体的粘性系数与温度之间的关系是？（）.
A、液体的粘性系数随温度的升高而增大。B、气体的粘性系数随温度的升高而增大。C、液体的粘性系数与温度无关。D、气体的粘性系数随温度的升高而降低。