题目:
单击命令按钮时,下列程序的执行结果是 Private Sub Command1_Click()Dim a As Integer, b As Integer, c As Integer a=3:b :4:c =5 Print SecProc ( c, b, a)End SubFunction FirProc(x As Integer, y As Integer, z As Integer) FirProc:2 * x + y + 3 * z+2End FunctionFunction SecProc( x As Integer, y As Integer, z As Integer) SecProc = FirProc ( z, x, y) + x + 7End Function
A.20
B.25
C.37
D.32
答案:
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参考答案:限制性核酸内切酶;DNA连接酶解析:获取目的基因时,需要用限制酶切割外源DNA,目的基因“插入”后连接在受体细胞染色体中需要用DNA连接酶。