单项选择题

下面哪一个对象用于与数据源建立连接：

A．. Command
B．Connection
C．DataReader
D．DataAdapter

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单项选择题

楼梯集中标注：BT1，h=120,1800/12，Φ10@150,；Φ10@120；FΦ8@200。楼梯踏步段下部纵筋间距为（） A. 120mm B. 150mm C. 200mm D. 180mm

What does the research show? Read the sentences below. Then listen again and write the correct letters (a–h) in the table below. Two answers below are extra.

答案： 1.c2.d g\n3.a\n4.b f