If you smell gas, ______ the gas, leave the house, and call the gas company.

A Popularity and use of natural gas B Natural gas reserves and supply C Natural gas prices D Clean fuel of choice E Disadvantages of natural gas F Natural gas consumption Paragraph 2______

砷盐检查古蔡法中，中国药典规定砷斑为（）。 A: 1.0μgAs B: 1.5μgAs C: 2.0μgAs D: 2.5μgAs

When<br/>some fruits emit (),<br/>it causes other fruits to ripen. A: ammonia<br/>gas B: oxygen<br/>gas C: ethylene<br/>gas D: nitrogen<br/>gas

The role and position of unconventional oil and gas resources in global oil and gas production are becoming more and more important. Which of the following are unconventional oil and gas resources? A: Tight rock oil and gas B: Mud shale oil and gas C: Coalbed methane D: Oil shale E: Oil sands F: Natural gas hydrate

__________ is natural gas that is found trapped within shale formations. It has become an increasingly important source of natural gas in the United States since the start of this century. A: Methane B: Shale gas C: Coal gas

The gas lift valve is the channel and switch where the gas enters the lift pipe.

通信软件的程序名称是（）。 A: IPCDeviceCfgMaker、exe B: IPCWork、exe C: IPCAnalyze、exe D: netrans、exe

gas cylinder ______

The parameters for predicting oil and gas PIIP include . A: Oil (gas) area B: Average thickness of oil (gas) layer C: Single storage coefficient D: Thickness of source rock