性比（sex ratio）
性比（sex ratio）
相关考题：
关系SC(S，SNAME，SEX，SCORE，CNAME)，从关系SC中检索男生(SEX =M)并且成绩大于等于60的学生姓名，下述表示( )是正确的。Ⅰ．ЛSNAME(σSCORE＞60□SEX='M'(SC))Ⅱ．σSCORE＞=60□SEX='M'(ЛSNAME(SC))Ⅲ．ЛSNAME(σSCORE＞=60□SEX='M'(ЛSNAME，SCORE，SEX(SC))A．Ⅰ和ⅡB．ⅡC．Ⅰ和ⅢD．Ⅰ
若有以下定义： struct tt{char name[10];char sex;}aa={"aaaa",′F′},*p= 则错误的语句是( )。选项格式：A.scanf("%c",a选项格式：A.sex);B.a选项格式：A.sex=getchar( );C.printf("%c\n",(*p).sex);D.printf("%c\n",p->sex);答案：A解析：sex是一个char类型变量，不是地址，A项应为scanf("%c"，B.a选项格式：A.sex=getchar( );C.printf("%c\n",(*p).sex);D.printf("%c\n",p->sex);
如果请求页面中存在两个单选按钮（假设单选按钮的名称为sex）， 分别代表男和女，该页面提交后，为了获得用户的选择项，可以使用以下（）方法。A、request.getParameter（sex）；B、request.getParameter（“sex”）；C、request.getParameterValues（sex）；D、request.getParameterValues（“sex”）；
使用（）语句，将Account表内的性别字段内容，全部都改为“男”。A、Update account SET Sex=´女´where Sex=´男´B、Update account SET Sex=´男´where Sex=´女´C、Update FROM account SET Sex=´女´where Sex=´男´D、Update FROM account SET Sex=´男´where Sex=´女´
Which of the following is the definition of CAS latency？（）A、 CAS latency is the ratio between the column access time and the clock cycle time.B、 CAS latency is the ratio between the row access time and the clock cycle time.C、 CAS latency is the ratio between the column access time and the data burst transfer time.D、 CAS latency is the ratio between the row access time and the data burst transfer time.
单选题If the compression ratio is increased on any diesel engine, （）Athe expansion ratio will decreaseBcombustion will be slowed downCthermal efficiency will decreaseDthermal efficiency will increase
问答题If there are only red, blue, and green marbles in a jar, what is the ratio of red to blue marbles? (1) The ratio of red to green marbles is 2:3. (2) The ratio of green to blue marbles is 6:5.
填空题The ratio of a to b is the same as the ratio of 1.4 to 7. If a＝14, what is the value of b?____
单选题The ratio of r to s is 3 to 4. The ratio of s to t is 2 to 9. What is the ratio of r to t?A1 to 3B1 to 6C2 to 9D3to10E4 to 5
单选题若有以下定义：struct tt{char name[10];char sex;} aa={aaaa,'F'},*p=aa;则错误的语句是（ ）。Ascanf(%c,aa.sex);Baa.sex=getchar();Cprintf(%c,(*p).sex);Dprintf(%c,p-sex);
单选题For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?（）AAn increase in compression ratio will increase the ignition lagBAn increase in compression ratio will decrease the ignition lagCA decrease in compression ratio will decrease the ignition lagDA decrease in ignition lag will increase the compression ratio
单选题The ratio of the height of a vessel’s rudder to its width is referred to as the（）.Aaspect ratioBconstriction ratioCrudder ratioDsteering ratio