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【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】磁力加热搅拌器是实验室的常用仪器,下列操作正确的是 ( )
A.
为了加强搅拌效果,可同时放入两粒磁转子进行搅拌。
B.
起动时,直接用高速档起动,容易达到更好的搅拌效果。
C.
磁力加热搅拌器应保持干燥,禁止溶液溅入机内,以免损坏机件。
D.
长时间连续加热后,应当用湿布对加热面板进行冷却。
【单选题】下列实验不能获得成功的是( ) 1 用甲烷气体通入溴水制 溴 甲烷 2 甲烷和 氯气 混合光照制取纯净的一 氯 甲烷 3 用洒精灯加热甲烷气体制取炭黑和氢气
A.
只有 ①
B.
只有 ③
C.
只有 ②
D.
①②③