【单选题】用电动势为E、内阻为r的电源对外电路供电,下列判断中正确的是( ) 1电源短路时,路端电压为零,电路电流达最大值 2外电路断开时,内电路电压为零,路端电压也为零 3路端电压增大时,流过电源的电流一定增大 4路端电压增大时,流过电源的电流一定减小
【判断题】Mental processes are processes of sensing. ()
【单选题】Business processes are collections of
A.
informal practices and behaviors.
B.
formalized and documented practices.
D.
rights and privileges.
【单选题】Business processes are collections of
B.
informal practices and behaviors.
C.
formalized and documented practices.
D.
rights and privileges.
【单选题】患者男性,50岁。患肝硬化3年,1h前呕血800ml,患者诉心慌乏。体检:精神萎靡,皮肤干燥。体温36.5℃,脉搏120次/分,呼吸24次/分,血压80/60mmHg。下列资料中枢属于主观资料的是
【判断题】Biological processes are cleaner and greener than chemical processes.
【单选题】三极管各个极的电位如下,处于放大状态的三极管是 。
A.
V B = 0.7 V , V E = 0 V , V C = 0.3 V
B.
V B = - 6.7 V , V E = - 7.4 V , V C = - 4 V
C.
V B = -3 V , V E = 0 V , V C = 6 V
D.
V B = 2.7 V , V E = 2 V , V C = 2 V
【简答题】Creep processes are diffusion controlled, and are therefore sensitive to temperature and holding time. This is demonstrated in Fig.2.