采用比例微分控制规律的原因一般是（）。A、减小余差，抑制系统振荡 B、被控对象的滞后

改错。

( ) 1. The small bag have got two wheels.

                      A            B                   C         _______  

( ) 2. This red T-shirt is to big for me.

                                     A B       C                 _______

(     ) 3. My mother will buys me a new bike.

                                       A    B      C             _______

Today is his        at the new school.[ ]

A. the first day              

B. first day            

C. one day            

D. the one day

不属于颞动脉炎表现的为（）

A.一侧或双侧颞部疼痛

B.沿颞动脉触痛、搏动减弱或消失

C.视力障碍

D.约一半以上的患者合并风湿性肌痛

E.颞区红肿

S700K转辙机动作杆动程有（）、220mm、240mm三种.

A.120mm

B.150mm

C.170mm

D.200mm