a="1234567890"，a【7:-2】表示（）

当执行以下程序时，输入 1234567890＜ 回车 ＞ ，则其中 while 循环体将执行 【 7 】 次。

＃ include ＜stdio.h＞

main()

{ char ch;

w hile((ch=getchar())== '0') printf("#");

}

A.7

B.6

C.0

D.10

A.4

B.5

C.3

D.6

A.123456

B.12

C.56

D.1234567890

语句“mid("1234567890"，3，3)”的返回值是()。

A.345

B.234

C.456

D.7890

如果配件号码是1234567890，改成实际修理工时代码应是()

A.甲骨文数字

B.罗马数字

C.阿拉伯数字

D.希腊数字

A.wep authentication-method open wep key wep-40 hex 0 1234567890 wep default-key 0

B.security-policy wep policy wep share-key wep key wep-40 hex 0 1234567890 wep default-key 0

C.authentication policy wpa wpa authentication-method share-key wpa key wpa-40 hex 0 1234567890 wpa default-key 0

D.authentication policy wpa2 wpa2 authentication-method share-key wpa2 key wpa2-40 hex 0 1234567890 wpa2 default-key 0

A.security-policy wep wep authentication-method open wep key wep-40 hex 0 1234567890 wep default-key 0

B.security-policy wep policy wep share-key wep key wep-40 hex 0 1234567890 wep default-key 0

C.authentication policy wpa wpa authentication-method share-key wpa key wpa-40 hex 0 1234567890 wpa default-key 0

D.authentication policy wpa2 wpa2 authentication-method share-key wpa2 key wpa2-40 hex 0 1234567890 wpa2 defau