天麻地下块茎发育时期不同，可按形态大小和用途，将其分为箭麻、米麻、（）和母麻四种类型

根据句意，用括号内所给动词的适当形式填空。

1. You shouldn't have _____ (leave) so soon at the party.

2. He is _____ (suppose) to arrive at the station at 8:40.

3. They lay on the beach, _____ (look) up into the blue sky.

4. Eating dumplings at the Spring Festival _____ (be) the custom in our country.

5. I was very embarrassed at the party because I _____ (wear) the wrong clothes.

“金龙鱼“牌食用调和油，瓶上标有“5L“字样，已知瓶内调和油的密度为0.92×10³kg/m³，则该瓶油的质量是______kg．如果调和油用去一半，则剩余半瓶调和油的密度为______g/cm³．

染色质结构如何调节基因的转录？

加快城镇化进程，必须逐步提高城镇化水平，坚持大中小城市和小城镇协调发展，走中国特色的城镇化道路。

在GB/T709-2006标准中对钢板的定义是：不固定边部变形的热轧扁平钢材。