燃油锅炉点火前,检查锅炉炉膛应无()现象。
A、跑油
B、漏油
C、渗油
D、积油
参考答案:D
Read and find. (读对话,选择恰当的句子,将标号写在横线上)
Jane: Peter, look at this picture.
Peter: _____
Jane: What can you see in the picture?
Jane: How many cats can you see?
Peter: Let me count. One, two, three…_____
导游等级以4种不同的颜色加以区分,其中中级为()。
A.灰色
B.粉米色
C.淡黄色
D.金黄色