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举一反三
【多选题】对楼板的要求有()。
A.
楼板应有足够的强度，能够承受使用荷载和自重
B.
应有一定的刚 度，在荷载作用下挠度变形不超过规定数值
C.
应满足隔声要求，包括隔绝空气传声和固体传声
D.
应有一定的装饰效果
E.
应有一定的防潮．防水和防火能力
【单选题】有如下事件过程：Private Sub Form_Load() Show Dim Arr() As Variant Arr = Array(1, 3, 5, 7, 9, 11, 13, 15) Call converse(Arr) For i = 0 To 7 Print arr(i); Next iEnd Sub 以上程序的功能是，通过调用Converse过程，将数组Arr中的元素逆序存放并输出...
A.
Private Sub converse(dim a() as Variant ) Dim T For i = LBound(A) To UBound(A) T = a(i) a(i) = a(UBound(A) - i) a(UBound(A) - i) = T Next i End Sub
B.
Private Sub converse(dim a() as Variant) Dim T Dim J As Integer J = (LBound(A) + UBound(A)) / 2 For i = LBound(A) To J T = a(i) a(i) = a(UBound(A) - i) a(UBound(A) - i) = T Next i End Sub
C.
Private Sub converse(a() As Variant) Dim T For i = LBound(A) To UBound(A) T = a(i) a(i) = a(UBound(A) - i) a(UBound(A) - i) = T Next i End Sub
D.
Private Sub converse(a() As Variant) Dim T Dim J As Integer J = Int((LBound(A) + UBound(A)) / 2) For i = LBound(A) To J T = a(i) a(i) = a(UBound(A) - i) a(UBound(A) - i) = T Next i End Sub
【单选题】β片层结构:
A.
只存在于α角蛋白中
B.
只有反平行结构,没有平行式结构
C.
α螺旋是右手螺旋,β片层是左手螺旋
D.
主链骨架呈锯齿形成的片层
E.
肽平面的二面角与α螺旋的相同