题目内容

测定重金属铅使用的燃气为

A. 空气
B. 乙炔
C. 笑气
D. 氢气

查看答案
更多问题

The ____of fresh coffee permeated the air.

The air was ____with the smell of orange blossoms.

Food assistance programs increase food security and reduce hunger by providing children and low-income individuals with access to ____food.

Both doctors and nurses have increasingly made a ____of the care of the aged.

答案查题题库