【单选题】若函数 y=ax与y= b x 在(0,+∞) 上都是减函数,则y=ax 2 +bx在(-∞,0)上是( )
【简答题】抗逆性(stress resistance)
【单选题】初孕妇,妊娠37+2周,基础血压不高。近5天头痛、眼花,血压160/100mmHg(21.3/13.3kPa),尿蛋白(++),尿雌激素/肌酐值为11,胎心148次/分,此时如何处理最恰当
【单选题】What is the characteristic resistance of a solar cell?
A.
The parasitic series resistance
B.
The parasitic shunt resistance
C.
The resistance that should be externally connected to extract the maximum power
D.
The variation of internal resistance with temperature
【简答题】(本小题满分12分)在a>0时,设命题p:函数y=a x 在R上单调递增;命题q:不等式ax 2 -ax+1>0对x∈R恒成立,若p∧q为假,p∨q为真,求a的取值范围.
【简答题】若函数y=ax与y=- b x 在(0,+∞)上都是减函数,则y=ax 2 +bx在(0,+∞)上是( ) A.增函数 B.减函数 C.先增后减 D.先减后增
【单选题】The major component of pulmonary inelastic resistance is
C.
viscous resistance of tissue.
E.
elastic recoil of the lung.
【单选题】若函数y=ax与y=- 在(0,+∞)上都是减函数,则y=ax 2 +bx在(0,+∞)上是( )