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【单选题】
维生素A具有保护夜视的生理功能，其主要来源为
A.
动物肝脏、蛋黄、胡萝卜等有色蔬菜
B.
奶黄、新鲜蔬菜、螃蟹等
C.
瘦肉、贝类、豆制品
D.
柑橘类、番茄、草莓等水果
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】夜视技术是在夜间或低照度条件下,扩展观察者视力范围的技术。当前,各国根据( )技术和( )技术,并研制出多种类型的夜视器材。
A.
微光夜视
B.
红外夜视
C.
激光夜视
D.
雷达夜视
【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