两性离子型表面活性剂是()。
A、泊洛沙姆
B、新洁尔灭
C、卵磷脂
D、洗衣粉类
E、硅藻土
参考答案:C
When assessing a client as a candidate for crutch walking, the nurse should take into account that for some elderly people, crutch walking is an impractical goal primarily because which of the following reason
A. Decreased reaction time.B. Decreased visual acuity.C. Decreased motor coordination.D. Decreased level of comprehension.
在采用比例调节器组成的控制系统中,当减小比例带时,对系统动态过程的影响是()。
①超调量减小;
②上升时间tr短;
③波动次数N增多;
④峰值时间tP;
⑤静态偏差ε大;
⑥过渡过程时间ts缩短。
A.②③
B.①④
C.⑤⑥
D.①③