搜题请搜索小程序“爱下问搜题”
问题 选择题

用黄色公鼠甲分别与两只黑色母鼠乙和丙交配，在几次产仔中，母鼠乙产仔鼠为9黑3黄，母鼠丙产16只黑鼠，则甲、乙、丙中最可能是纯合体的为[ ]

A．甲和乙

B．只有丙

C．乙和丙

D．甲和丙

答案

答案：D

填空题

已知∠α与∠β互余，且∠α=30 °，则∠β的补角为（    ）度．
查看答案
单项选择题

The project time management processes include ______ .

A．define activities, sequence activities, estimate activity resources, and estimate activity durations

B．define activities, activity sequencing, and activity duration estimating

C．activity identification, activity execution, and activity results

D．activity determination, activity duration estimating, activity implementation, and activity results
查看答案