查询词典 null function

Racemates have a net null optical rotation, and their physical properties may differ from those of the component enantiomers.

外消旋物有净无效旋光，并且他们的物理特性可能与那些组成部分中的对应结构体不同。

Zhou WY%Wei WH Study on population dynamic of polecats and its effective factors Acta Biological Plateau Sinica , 1994,null

张道川%樊乃昌%印红达乌尔鼠兔和高原鼠兔行为特征的比较分析河北大学学报， 2001，1

If the pLast is not null, then the user is dragging, and the mouse has moved from itsprevious point.

不为空，那么用户正在拖动，鼠标从前一个点移动到现在的位置。

In the first simple and easy after the first host of the principles of the power jack plug for a power test, the null and void, it will display normal use to remove the power cord to connect the host, the host returned to normal.

本着先简单后容易的原则先将主机的电源插头换一个电源插孔试之，无效，便将正常使用的显示器电源线取下连接主机，主机恢复正常。

If the spasm of morphine and other drugs taken at the same time, can cure patients with myocardial infarction precordial pain or visceral pain caused by the disease, cardiac asthma also have good results, in particular, apply to other analgesics for acute pain null and void, Such as severe fractures, wounds, burns and so on, the remarkable effect.

吗啡若与其他解痉药同时服用，可治疗心肌梗塞患者的心前区剧痛或内脏疾病引起的剧痛，对心源性哮喘也有良好效果，特别适用于其他镇痛药无效的急性疼痛，如严重的骨折、创伤、烧伤等，其疗效卓著。

Methods and Results— Wild-type and MCP-1-null mice underwent daily 15-minute coronary occlusions followed by reperfusion.

方法和结果－野生型和MCP-1-null小鼠每天予以15 分钟的冠状动脉闭塞和再灌注。

Methods and Results— Wild-type and MCP-1-null mice underwent daily 15-minute coronary occlusions followed by reperfusion.

方法和结果：对野生型和MCP-1缺失型鼠每天给予15分钟管脉阻塞然后再灌注。

If NULLs were not indexed, then the optimizer could only use indexes on columns with NOT NULL constraints.

如果觉得效率太慢，可以适当增加块的读取数和查询的并行度来加快全表扫描的速度。

To identify nulls in SQL, use the IS NULL predicate.

用户可以使用 SQL 函数 NVL 将空值转换为非空值。

Also omitted to spare you is some chicanery with NULLing the frame menu. When you call LoadMenu, CMenuBar automatically sets your frame's menu to NULL.

为了使你省去清空框架菜单的纠缠，当你呼叫 LoadMenu 时， CMenuBar 自动的清空你的框架菜单。

A backer of an Afghan law that critics say legalizes marital rape has rejected the international outcry as foreign meddling.

饱受批评的一项法律的拥护者说合法化的婚内暴力不会受国际舆论的干涉。

Years ago, a ancient Egyptian fleet went to the Land of punt for seeking a kind of flavor named "myrrh", and aromatic plants which has dense exotic style for the queen Hatshepsut.

3500年前的一个古埃及的舰队到&彭特之地&寻找一种叫没药的香料。