实际生产中，生产性毒物常以气体、蒸气、雾、烟尘或粉尘的形式污染生产环境，从而对人体产生毒害。
参考答案：对
心理评估是什么？有什么意义？
Speaker A: Want to come over Thursday for supper? Speaker B:（）
A.I really can't. You'll not mind, I think
B.Let's put it off till later
C.Thanks, but I have to work that evening
D.No, I don't want to
