膨胀阀
参考答案：膨胀阀：既是制冷系统的节流器件，又是制冷剂流量的调节控制器件。
与真菌相比，细菌的结构中没有
A．细胞壁
B．细胞膜
C．细胞质
D．成形的细胞核
Which flight am I going to take().
A.Flight 487 leaving at 4:56 pm.
B.Flight 347 leaving at 6:45 pm.
C.Flight 437 leaving at 6:45 pm.
D.Flight 477 leaving at 5:40 pm.
