混凝土外加剂检测用公称粒径为5mm～20mm的石子，可采用碎石，也可用卵石，但如有争议，以碎石结果为准。
参考答案：对
请以“我的一片蓝天”为题目，写一篇文章。
要求：自主确定文体（不要写成诗歌）；不少于800字。
Speaker A: I think I’m coming down with something. Speaker B: ().
A. You shouldn’t tell me, you should tell the doctor.
B. Maybe you’d better see a doctor.
C. When did you come down with a cold
D. Don’t worry. Everything will be all right.
