水性凝胶基质（）。 A: Freon B: Azone C: Carbomer D: Poloxamer E: Eudragit L

水性凝胶基质（）。 A: Freon B: Azone C: Carbomer D: P010xamer E: Eudragit L

以下是气雾剂的抛射剂的是（）。 A: Freon B: Azone C: Carbomer

Which of the following are greenhouse gases? A: Methane. B: Carbon dioxide. C: Argon. D: Freon gas.

以下是气雾剂抛射剂的是（） A: Freon B: Azone C: Carbomer D: Poloxamer E: EudragitL

Which of the following is used in an IBM Blade Center to provide cooling？（） A: Fans for each blade B: Chilled Water C: Blowers D: Freon

You can travel _____, but children under five travel ____. A: freely … free B: free … freely C: free … free D: freely … freely

Which are the possible ways to protect our environment? A: To choose energy-conserving electrical appliances. B: To choose freon-free products. C: To take a bus as much as possible. D: To take a car as much as possible.

In a “first-best” world：（ ） A: Free trade is not optimal. B: Free trade is economically efficient. C: Free trade benefits everyone. D: Free trade harms everyone.

If no gaskets are used in the piping joints of a Freon system, the joints must be（） A: finished joints B: welded joints C: ground joints D: soldered joint