用高率放电计检查汽车铅蓄电池的放电程度,当蓄电池放电达50%时,其单格电压应在()范围内。
A.1.7~1.8
B.1.5~1.6
C.1.4~1.5
D.1.3~1.4
参考答案:B
I’m sorry that I have kept you me so long. [ ]
A. waiting
B. waiting for
C. to wait
D. to wait for
排除客户异议,电信业务员需要做好哪些工作?