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

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问答题
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
单项选择题
可以同时声明定义多个同类型变量，变量之间用逗号分隔
A、正确
B、错误