正压式消防空气呼吸器执行()标准。
参考答案:125-2006《正压式消防空气呼吸器》
— Tom, you've got an A in the final English exam. Congratulations!
— Thanks. But I never thought the result came out so fast. The papers ______ when I left the teacher's
office just now.[ ]
A. had been marked
B. were still being marked
C. are still marking
D. had been marking
某工程队修筑公路,前3天共修筑4.48千米,后7天平均每天修筑1.36千米.这个工程队平均每天修筑公路多少千米?