查询词典 null

SQL NULL values are mapped to and from Python's NULL object, None.

SQL 的 NULL 值被映射为 Pyhton的 NULL 对象，也就是 None。

Once you have inserted a null into the container, you must always check if the value is null before accessing the object

一旦你向容器插入了一个 null，你就必须在访问该对象前检查它是否为 null

Of zero, or the Null object None.of zero, or the Null object None.

空对象、值为零的任何数字或者Null对象 None的布尔值都是False。

In general, the dipole components are located at the zero potential plane, called null plane. However, for 3D topographic mapping, many zero potential points can be detected. Instead of testing all the possible points, the proposed approach is to fit the selected zero potentials in terms of a linear plane, i.e. null plane, via least square approach.

一般来说，电偶极的位置都在零电位面上，为了取得零电位面，本研究在三度空间拓朴图映射中找出多点零电位点，然后采用最小平方法，找出一个线性平面通过这些零电位点当做零电位面。

NULL is the value of a null pointer constant.

NULL 是固定空指针的值。

In C, NULL is defined as a null void pointer.

在C中，NULL 定义为一个null void指标。

In pointer context, the integer constant zero means "null pointer"- irrespective of the actual binary representation of a null pointer.

本节将指导您一些 C++中积灰尘的角落，这些往往被滥用，或是人们常常出错的地方。

The buffered-crossbar switch architecture is studied. In this paper, the maximum weight fast algorithm is used in BX, we discover the null row phenomenon in BX's maximum weight fast algorithms, and propose a doubling weight solution for null row, this promotes the performance of maximum weight fast algorithms in BX.

对缓冲Crossbar交换结构进行了研究，论文中将最大权重优先算法应用于BX结构，并对其在BX结构由于存在空列现象所导致的性能恶化提出了空列权重加倍的解决方案，提高了最大权重优先算法在不均衡负载下的性能。

If any variable element is a null string, the result propagates the non-null elements

如果有变量元素为空字符串，则结果只含非空元素

If a string-based field has null=True , that means it has two possible values for "no data": NULL , and the empty string.

如果一个基于字符串的字段类型设置了 null=True，这就意味着有两种可能的值用于表示"没有数据"：NULL 和空字符串。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。