已知等差数列an前17项和S17=51，则a5-a7+a9-a11+a13=______． A: 3 B: 6 C: 17 D: 51

反应CaO(s)+CO2(g) →CaCO3(s)在1073K时的KΘ=100/17，此时的分压为（ ）。 A: （100/17）pΘ B: (100/17)1/2pΘ C: (17/100)pΘ D: (100/17)2p

Anew McDonald’s opens every 17 hours somewhere in the world. A: Every 17 hours there isa new McDonald’s B: Every 70 hours there isa new McDonald’s C: Every 7 hours there isa new McDonald’s D: Every day there isa new McDonald’s

下列信息是某系统用ps-ef命令列出的正在运行的进程，进程是运行Inteme倔级服务器，它负责监听Intemetsockets上的连接，并调用合适的服务器来处理接收的信息（） A: rootl4.00.0344204？S17: 090： OOinit B: root20.00.129161520？S17： 090： 00/sbin/getty C: root30.00.213646322S17： 090： 00/usr/sbin/syslogd D: root40.013441204？S17： 090： 10/usr/sbin/inetd

St Patrick's birthday is celebrated on March 17 each year.( )

17 A: In sports ground. B: At Joe’s home. C: In extracurricular activities. D: At Joe’s high school.

脂肪醇聚氧乙烯醚、S17、油醇聚氧乙烯醚是用一种东西吗?

What was Michael's personal best record before he set a new national record? A: 17 feet 6½ inches B: 17 feet 6 inches C: 17 feet D: 16 feet 9 inches

根据下面的定义，能输出字符串'Mary'的语句是（ ）。struct worker{char name[18]; int age;};struct worker w[100]={"John",16,"Paul",17,"Mary",17 }; A: printf("%s",w[1].name); B: printf("%s",w[2].name); C: printf("%s",w[1]); D: printf("%s",w[2]);

What percentage of Earth´s water is fresh water? A: 2,5 % B: 7 % C: 17 % D: 23 %