【单选题】根据发票管理办法的规定,纳税人已开具的发票存根联和发票登记簿的保存期限是( )。(单选题)
【单选题】— ______ boy is Tom? —The one in a red cap. [ ]
【单选题】根据发票管理办法的规定,纳税人已开具的发票存根联和发票登记簿的保存期限是( )。
【简答题】求P(S2/σ2≤2.041),其中,S2为样本方差;
【单选题】Which of the following is NOT a function of the mRNA cap?
A.
protects the mRNA from degradation
B.
enhances translatability of the mRNA
C.
enhances transport of the mRNA to the cytoplasm
D.
enhances splicing of the mRNA
E.
helps regulate expression of the mRNA
【单选题】以下程序的输出是? #include using namespace std; int main() { char s1='W'; char s2='X'; char &rs=s1; rs = s2; char *ps = &s1; ps = &s2; cout<
【简答题】串s1=‘abcdefg’,s2=‘hijkl’,则concat(substr(s1,2,strlen(s2)),substr(s1,strlen(s2),2))=_________。
【多选题】给排水专业建模中排水管道不得穿越以下哪些位置()