7/3,21/5,49/8,131/13,337/21,()
A.885/34;
B.887/34;
C.887/33;
D.889/3
A.885/34;
B.887/34;
C.887/33;
D.889/3
A.(3,12) (7,12)
B.(5,12) (5,12)
C.(3,21) (7,21)
D.(5,21) (5,21)
检测100个Lae-突变体,分别测定它们的回复率。其中,45个回复率是10-5,49个是3×10-6,3个是3×10-11,3个是10-10。回复率为10-10突变体的类型属于点突变体、琥珀型突变体、双突变体还是缺失突变体?
On the xy-coordinate plane, a point defined by the (x,y) pair (m,2) lies on a circle with center (3,21) and radius 5.Which of the following is a possible value of m?
A.8
B.6
C.21
D.22
E.27
若有以下定义和语句 struct a { int n,m;}; struct a st[3]={{1,20},{2,19},{3,21}}; struct a*p=st; 则以下错误的引用是
A.(p++)->n;
B.st[0].n;
C.(*p).n;
D.p=&st.m;
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