显性致死试验的遗传学终点为
A．基因突变B．染色体畸变C．DNA完整性改变D．细胞坏死E．细胞恶性转化
参考答案：B
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
A.automatically suppressed
B.finished by the operator
C.manually suppressed
D.done again
兼并指的是：（）
A.吸收合并
B.新设合并
C.承担债务式合并
D.购买式合并
