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Any letters beyond these requirements are to be excluded, so if the decree specifies k comparisons then the new alphabet will contain the first k+1 lowercase letters of the current alphabet. Create a class Alphabet that contains the method choices that takes the decree as input and returns the number of possible new alphabets that conform to the decree. If more than 1,000,000,000 are possible, return -1. Definition Class: Alphabet Method: choices Parameters: string Returns: int Method signature: int choices Constraints decree contains between 1 and 25 characters inclusive.

我注：如上面的BAA有3个字符，那么新表就有4个，也就是'd'后面的全被忽略创建一个名为Alphabet的类，此类含有一个名为choices方法，choices方法以&规定&作为参数输入，然后返回所有符合这个规定的新字母表的可能数，如果大于1，000，000，000可能，就返回-1 定义：类名：Alphabet 方法：choices 参数类型：string 返回值类型：int 方法签名：int choices (确保choices为公有方法)参数条件：规定中的'B'和'A'总和必须大于等于1，小于等于25 举个例输入：&BAA&返回：3 解释：因为根据规定'a'在'b'的前面，'b'在'c'的后面，'c'在'd'的后面，所有符合这个规定的新字母表有3个：adcb、dacb和

A APDL program is developed for analyzing the contact stress of journal bearing pair of roller cone bit. The 25 contact stress cases of different clearance fit(including clearance of large bearing is bigger, equal to and smaller than that of small bearing) journal bearing pair of the 8 1/2XXX roller cone bit are analyzed. The result is that the maximum contact stress is less when the clearance of large journal bearing pair is smaller than or equal to that of small journal bearing pair.

用参数化设计语言APDL编制了牙轮钻头滑动轴承的ANSYS接触有限元分析程序，根据钻头制造厂方提供的某8 1/2的轴承配合间隙尺寸，分三种不同的间隙配合（大轴间隙大于小轴间隙、大轴间隙等于小轴间隙、大轴间隙小于小轴间隙），共25种情况，对轴承的表面的接触应力进行了分析，得出：大轴间隙小于等于小轴间隙时最大应力比较小。

If the Laplace transform of an infinite series were equal to the sum of its term-by-term Laplace transform then the Borel sum would be equal to the usual sum.

如果无限系列的 Laplace 转换然后等于其逐条款的 Laplace 转换的总和 Borel 总和会等于通常总和。

A unit of force equal to the force that imparts an acceleration of 1 m/sec/sec to a mass of 1 kilogram; equal to 100,000 dynes.

力的单位等于使公斤质量的物体产生米平方秒的加速度所需的力；等于，达因。

The so-called plasticity seal, the seal is the sealing surface pressure is equal Sealing than the soft material yield limit, so that Pressure sealing globe valve joint surface in close contact, use the plastic deformation of soft materials, blockage hardware uneven surface, giving rise to approximate the ideal plane, and produce equivalent soft material yield limit of the reaction and remain sealed.

所谓塑性法密封，就是密封面的密封比压等于密封副软材料的屈服极限，使结合面紧密接触，利用软材料的塑变而堵塞硬件表面的不平处，形成近似理想平面，并产生等于软材料屈服极限的反力而保持密封。

A unit of volume equal to two hogsheads, usually the equivalent of

大酒桶的容量：等于两桶之容量的一种容量单位，通常等于126美国加仑

B Pumps, for liquid propel lants, with shaft speeds equal to or greater than 8,000 RPM or with discharge pressures equal to or greater than 7,000 kPa.

用于液体推进剂的、转速等于或大于8000转/分，并且出口压力等于或大于7000千帕的泵

Tz = 2Gk q 即 z = 2Gk q /T 40 Suppose the volume between membrane and the boundary plane is V, and we notice that 2 ∫∫ d x d y = M Then we have Thereby we have q qM V =∫∫ zdxdy =∫∫ dxdy = 2GTk 4GTk M 2 Gk = 2V q /T From τ zx =τ xz =, y z 2Gk τ zx /= y q / T τ z y =τ yz = x 41 Moreover, we get 设薄膜及其边界平面之间的体积为V,并注意到 2 ∫∫ d x d y = M 则有从而有由又可得 q qM V =∫∫ zdxdy =∫∫ dxdy = 2GTk 4GTk M 2 Gk = 2V q /T τ zx =τ xz =, y z 2Gk τ zx /= y q / T τ z y =τ yz = x 42 Adjust the pressure q of which the membrane is under, and make the rights of formulas,, equal to one, then we can gain some conclusions as follows:(1) The stress function of wringed pole equals to the uprightness angle of the membrane (2) The torsion M which wringed pole received equals to two times of the volume between the membrane and the boundary plane.

o b y a x 43 调整薄膜所受的压力q，使得，，三式等号的右边为1，则可得出如下结论：(1)扭杆的应力函数等于薄膜的垂度z。(2)扭杆所受的扭矩M等于该薄膜及其边界平面之间的体积的两倍。

Let us note that the related to the first model desktopprocessor core 2 Extreme QX6850 (3.0 GHz) has larger TDPlevel , equal to 130 W. The efficiency of the second announced intel processors is just amazing, the TDPlevel perone core is equal to 12,5 W. Thisgiven processors consume upto 50% less energy due tonew energy-saving technology.!!!!!

让我们注意到，有关第一模式桌上型处理器核心2极端qx6850 （ 3.0千兆赫），较大神灯水平，等于130文的效率，二宣布英特尔处理器只是惊奇，神灯一级每一个核心等于12，5文鉴于此处理器的消费高达50 ％的能源，由于节能新技术。！！！！！

The number of nepers is the logarithm of the ratio of the measured power levels.

奈培数等于所测的电平功率与参考电平的比值取自然对数。1奈培等于8.686分贝。

With the development of highway construction, the speed of cars has been gradually increased.

随着公路的发展，汽车的车速也在不断提高。

So we basically had to develop a bond with the animal in terms of socializing with it.

所以我们就主要想通过跟它沟通的方式来建立一种良好的关系。