问题
单项选择题
锅炉有（）情况时，应进行内部检验。
①移装锅炉投运前；
②锅炉停止运行一年以上需要恢复运行前；
③新移装的锅炉运行一年后；
④根据上次内部检验结果和锅炉运行情况，对设备安全可靠性有怀疑时。
A.①②③；
B.②③④；
C.①②③④；
D.①③④。
答案
参考答案：C
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锅炉有（）情况时，应进行内部检验。
①移装锅炉投运前；
②锅炉停止运行一年以上需要恢复运行前；
③新移装的锅炉运行一年后；
④根据上次内部检验结果和锅炉运行情况，对设备安全可靠性有怀疑时。
A.①②③；
B.②③④；
C.①②③④；
D.①③④。
参考答案：C
| 选词填空。选择方框里的单词并用其恰当形式填空，使短文完整，句意通顺。 | |
me and I have a lot of friends. We often play 2. together. I feel happy that I am a fish because I love swimming. My mother often tells me something about the sea. I hope I can swim to the sea one day. My mother is worried about me. She often warns me to be 3. . I know she is right. Mother loves me and I love her, too. These days the water of the river is 4. than before. People often throw the rubbish into the river. It's dangerous to live here. We have to 5. to the clean water, maybe to the sea. |