对于保证安全的技术措施，（）是错误的。
A.停电
B.验电
C.装设接地线
D.口头和电话命令
参考答案：D
—How can I get more information about your products?
—_____ to call the sales office or visit our website.
A．Go ahead
B．You are wanted
C．You need
D．You are welcome
ANUG是哪一年由Vincent(奋森)首次报告
A．1888
B．1898
C．1788
D．1918
E．1909
