最适于根系生长的容重是（）克/立方厘米。
参考答案：1.0-1.2
完成对话，每空一词
A: Can I help you?
B: Yes, (1)______. I'd like a sweater.
A: We have quite a few here. How (2)______ this one?
B: Good. (3)______ (4)______ are they?
A: Ten dollars.
B: OK. I'll (5)______ it. Thank you very much.
A: You are (6)______.
钢筋直螺纹接头标准型接头安装后的外露螺纹不宜超过（）牙。
