当桁架的支撑杆位钢管结构,而腹杆为角钢时,不能直接连接,必须加工一套和连接板外形尺寸()的垫铁,以便于连接。
A、略小
B、略大
C、相同
D、不同
参考答案:C
-__________
-It's very hot.[ ]
A. What bad weather!
B. It's a fine day,isn't it?
C. Do you like the day?
D. How is the weather in Chongqing?
胡麻栽培技术除草、追肥有哪些注意事项?