问题
单项选择题
闸板BOP可长期封井，长期封井应手动锁紧，并将换向阀手柄扳向（）。
A、开位
B、中位
C、关位
答案
参考答案：B
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闸板BOP可长期封井，长期封井应手动锁紧，并将换向阀手柄扳向（）。
A、开位
B、中位
C、关位
参考答案：B
| 用方框中所给单词的适当形式填空，每个单词限用一次。 | |
2. The food that my father cooks ___________ good. 3. We should ___________ the house as soon as possible, or it'll be quite dangerous. 4. The population in that country ___________ slowly now. 5. Wild and Wind is a rock band which as the name suggests is full of ___________. |