当只接通点火开关,而未起动发动机时,发动机故障灯点亮,表明故障灯电路良好。
参考答案:对
________ mothers can't come to the meeting because they have gone to Dalian.
A.Sally's and Jane
B.Sally and Jane's
C.Sally and Janes'
D.Sally’s and Jane's
有Na2SO3、BaCl2、Na2SO4、NaHCO3等四瓶溶液,只用一种试剂进行鉴别,应选用的试剂是[ ]
A.Na2CO3溶液
B.硝酸
C.硫酸
D.AgNO3