支撑相末期为步行周期的()
A.5%~10%
B.10%~20%
C.20%~30%
D.15%~20%
E.10%~12%
参考答案:E
Harry telephoned to the airport to______ whether Flight 24 for San Francisco is departing on time.
A.prove
B.ensure
C.confirm
D.identify
请在下面的IP地址中选出哪个是专用于本地主机的回环地址()。
A.202.112.0.33
B.192.10.2.254
C.255.255.255.0
D.127.0.0.1