For the network 192.0.2.0/23, which option is a valid IP address that can be assigned to a host?()
第1题:
删除仓库关系中仓库号值为WH2的元组,应使用命令
A.DELETE FROM 仓库 WHERE 仓库号="WH2"
B.DROP FROM 仓库 WHERE 仓库号="WH2"
C.DELETE 仓库 WHERE 仓库号="WH2"
D.DROP FROM仓库 WHERE 仓库号=WH2
第2题:
A、Wh=10,Bh=80
B、Wh=60,Bh=20,Ch=0.1
C、Wh=20,Bh=15,Ch=0.3
D、Wh=0.4,Bh=110
第3题:
A.yes-no question
B.or question and wh-question
C.yes-no question
D.tag question and wh-question
第4题:
在SQL语句中,与表达式“仓库号NOT IN("whl","wh2")”功能相同的表达式是 ______。
A.仓库号="wh1" AND仓库号="wh2"
B.仓库号!="wh1"OR仓库号#"wh2",
C.仓库号<>"wh1" OR仓库号!"wh2"
D.仓库号户'whl,tAND仓库号!:”wh2”
第5题:
下列定义变量错误的是( )。
A.char s="23";
B.short i=100;
C.double d;
D.String str=-"wh are me!";
第6题:
A NP–movement/WH-movement
B NP–movement/Aux-movement
C AUX-movement/WH–movement
D WH–movement/AUX-movement
第7题:
A、Wh=28.5,Bh=19,Ch=0.15
B、Wh=0.5,Bh=120,Ch=0.03
C、Wh=1.0,Bh=100.5,Ch=0.05
D、Wh=80,Bh=2.05,Ch=0.01
第8题:
理论塔板数为( )。
A.n=5.44(tR/Wh/2)
B.n=5.54(tR/Wh/2)
C.n=5.54(tR/W)2
D.n=5.44(tR/Wh/2)2
E.n=5.54(tR/Wh/2)2
第9题:
在SQL语句中,与表达式“仓库号NOT IN(“wh1”,“wh2”)”功能相同的表达式是
A.仓库号=“wh1”AND仓库号:“wh2”
B.仓库号!=“wh1”OR仓库号:=“wh2”
C.仓库号<>“wh1”OR仓库号!=“wh2”
D.仓库号!=“wh1”AND仓库号!=“wh2”
第10题:
在SQL语句中,与表达式“仓库号NOT IN("whl ","wh2")”功能相同的表达式是A)仓库号="wh1"AND仓库号="wh2"B)仓库号!="whl" OR仓库号="wh2"C) 仓库号<>"wh 1" OR仓库号!="wh2"D)仓库号!="whl" AND仓库号!= "wh2"