在直接受动力荷载作用的情况下，下列情况中采用（）连接方式最为适合。
A.焊缝
B.普通螺栓
C.承压型高强度螺栓
D.摩擦型高强度螺栓
参考答案：D
– Do you know William failed the exam, Jenny?
-- _____? As far as I know, he is always working hard.
A．So what
B．How come
C．Why not
D．What for
惟一能区别一个控件的属性是 ______ 。
A．Caption
B．Text
C．Name
D．Index
