Read and choose. （读句子，选择与句子相匹配的图片）

( )1. Excuse me, where is the washroom?

(     )2. Listen!  Students are having the music class now.

(     )3. I often play ping-pong in the gym.

(     )4. Do you often go to the library?

水泥浆凝固后，要求其能在井下（）及油水介质的长期作用下，其性能保持良好的稳定性。

A、高温低压

B、低温高压

C、高温高压

D、低温常压