电控气动风阀的优点是（）。
A.气缸加工精度高
B.无极调节跳汰频率
C.适应能力强
D.自动调节
参考答案：B, C, D
They believed, and ___did we, that these modern paintings collected in the Shanghai Art Gallery were as valuable as those in the Museum.
A．that
B．which
C．neither
D．so
提示左心室衰竭的是（）
A.奇脉
B.迟脉
C.无脉
D.交替脉
E.水冲脉
