悬臂梁在均布荷载作用下,在梁自由端处的剪力和弯矩为()
A.剪力为零、弯矩最大
B.剪力最大、弯矩为零
C.剪力为零、弯矩为零
D.剪力最大、弯矩最大
参考答案:C
----What _______ the children be doing?
----They _______ be playing a game called Bingo.
A.might; can
B.can; might
C.might; might
D.can; can
与细菌耐药性有关的遗传物质是()
A.异染颗粒
B.毒性噬菌体
C.质粒
D.细菌染色体
E.性菌毛