在从已知或怀疑含有硫化氢的地层中起出岩心之前应提高警惕。在岩_爱下问搜题

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问题单项选择题

在从已知或怀疑含有硫化氢的地层中起出岩心之前应提高警惕。在岩心筒到达地面以前至少（）个立柱，或在达到临界浓度时，应立即戴上正压式空气呼吸器。

A、5

B、10

C、15

答案

参考答案：B

单项选择题

Questions 24-30

·Look at the questions for this part.
·You will hear a passage about changes in the rankings of British universities.
·For questions 24-30, indicates which of the alternatives A, B, or C is the most appropriate response.
·Mark one letter A, B or C on the Answer Sheet.

Which university has the greatest endowment fund

A．Cambridge.

B．Oxford.

C．Harvar

判断题

党的基层组织无权剥夺党员的权利。