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Which statement is TRUE concerning combustible gas indicators ________．

A. One sample of air is adequate to test a tank
B. They do not work properly where there is a lack of oxygen
C. They will detect a lack of oxygen
D. They are calibrated to read the percentage chance of explosion

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人民政府正职领导人员，人民法院院长，人民检察院检察长的候选人数应当多一人，实行差额选举。()

Regulations define the bulkhead deck as ______．（subdivision and stability regulations）

A. any deck extending from stem to stern
B. the uppermost deck to which transverse watertight bulkheads extend
C. the lowermost deck to which transverse watertight bulkheads extend
D. the uppermost complete deck

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Which instrument is suitable for determining the presence of explosive concentrations of fuel oil vapors in tanks ________．

A flame safety lamp
B. A combustible gas indicator
C. A liquid cargo meter
D. All of the above

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()不属于中国古代木构建筑基本结构形式。

A. 井干式
B. 干阑式
C. 穿斗式
D. 抬梁式

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Which statement is TRUE concerning combustible gas indicators ________．

A. One sample of air is adequate to test a tank B. They do not work properly where there is a lack of oxygen C. They will detect a lack of oxygen D. They are calibrated to read the percentage chance of explosion

人民政府正职领导人员，人民法院院长，人民检察院检察长的候选人数应当多一人，实行差额选举。()

Regulations define the bulkhead deck as ______．（subdivision and stability regulations）

Which instrument is suitable for determining the presence of explosive concentrations of fuel oil vapors in tanks ________．

()不属于中国古代木构建筑基本结构形式。

A. One sample of air is adequate to test a tank
B. They do not work properly where there is a lack of oxygen
C. They will detect a lack of oxygen
D. They are calibrated to read the percentage chance of explosion