问题
单项选择题
仓泵进灰时应先()。
A.打开排气阀;
B.打开进气阀;
B.打开吹堵阀;
D.打开钟罩阀。
答案
参考答案:A
仓泵进灰时应先()。
A.打开排气阀;
B.打开进气阀;
B.打开吹堵阀;
D.打开钟罩阀。
参考答案:A
用方框中所给单词的适当形式填空,每个单词限用一次。 | |
2. I’m sorry, the plane ______ five minutes ago. 3. My little dog has been ______ for several days. 4. Jack is the ______ of the five boys. 5. —How can I get to the nearest post office? —Go ______ the bridge, you can see it on your right. |