问题
单项选择题
气动阀门减压阀组件中（）是稳定出口压力的元件。
A、膜片
B、弹簧
C、阀芯
D、节流孔
答案
参考答案：B
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气动阀门减压阀组件中（）是稳定出口压力的元件。
A、膜片
B、弹簧
C、阀芯
D、节流孔
参考答案：B
| Read and choose. 请从下面所给的答案中选出适当的内容选项。 | |
Li Ming and his friends are 1 . Li Ming is playing cards with Tim and Kim. They are loud. 2 . She is loud, too. Steven is drawing a picture. 3 . Where is Danny? He is sleeping 4 . Is he quiet? No, 5 . |