使用倾斜式微压计与皮托管测量管道的压力时,其接法要根据管道内的()。
A.流速而定
B.压力而定
C.直径而定
D.介质而定
参考答案:B
Personally, the job as a teacher _____ be challenging, for I sometimes _____ deal with some smarter but less diligent students.
A.can; have to
B.may; can
C.has to; may
D.ought to; must
概念:反射是指人体通过 对外界或者内部的各种 所发生的有规律的反应。反射是神经调节的基本方式。