汽车底盘传动系常见的故障有()。
A、冷却液温度过高
B、离合器分离不彻底
C、变速器跳挡
D、后桥异响
参考答案:B, C, D
下列说法正确的是( )
A.某酸H2A的钠盐NaHA溶液中:c(H2A)>c(A2-),则该溶液的pH>7
B.物质的量浓度相等的CH3COOH和CH3COONa溶液等体积混合后的溶液中:2c(Na+)=c(CH3COO-)
C.饱和Ca(OH)2溶液中加入一定量的生石灰,恢复至原来的温度,所得溶液的pH会增大
D.0.2mol•L-1NH4NO3和0.lmol•L-1NaOH溶液等体积混合后:c(NH4+)>c(NO3-)>c(Na+)>c(OH-)>c(H+)
First aid treatment for small cuts and open wounds is to().
A.lay the patient down and cover the wound when the bleeding stops
B.stop the bleeding,clean,medicate,and cover the wound
C.apply an ice pack to the wound and cover it when the bleeding stops
D.apply a hot towel to purge the wound,then medicate and cover it