()运行状况及发展趋势会直接或间接地对企业客户服务活动产生一定的影响。
A.市场人口
B.经济环境
C.社会环境
D.文化环境
参考答案:B
—Have you been watching TV? Don’t valuable time running.
—I’m not. I’m tired now and only am taking a short break.
A.give
B.waste
C.cost
D.spare
金属给水管道系统在试验压力下观察(),压力降不应大于0.02MPa,然后降到工作压力进行检查,应不渗漏。
A.5min
B.10min
C.l5rain
D.20min