四个

This experiment employed a 2×2×2 factorial design in which each of the three hypothesized facilitating factors was manipulated as an independent variable .

本研究通过微观和宏观两个角度，拟对动机内化的发生条件、心理机制、发展特点和影响因素四个方面进行研究。

To inestigate further, Dr. Fifer and colleagues examined surgical specimens from four patients who had undergone septal myectomy as long as 14 months after unsuccessful alcohol ablation.

为了进一步调查，Fifer博士和同事检查了四个病人的手术标本，他们已经在14个月里接受过心间隔肌切开手术和不成功的酒精消融。

Apart from its engines the first production model, the Bf 110G-1, was similar to earlier fighter-bomber variants, and the G-2 differed principally in the armament installed: two or four 20-mm.

除了其引擎的第一生产模式，利用高炉110g-1，是类似於早些时候歼击轰炸机变和G2不同，主要装备安装：两个或四个20毫米。

A small fipple flute with with four finger and two thumb .

带有四个手指和两个拇指的哨。

A small fipple flute with with four finger holes and two thumb holes.

带有四个手指孔和两个拇指孔的哨笛。

A small fipple flute with with four finger holes and two thumb holes .

带有四个手指孔和两个拇指孔的。

A small fipple flute with with four finger two thumb .

四个手指和两个拇指哨笛。

A rectangular finite element for laminated plate with bonded and/or embedded piezoelectric sensors and actuators is developed based on the variational principle and the first order shear deformation theory.

基于变分原理和一阶剪切理论，本文建立了一种新的机电耦合矩形有限单元，该单元具有四个节点20个位移自由度，电自由度为单元中的压电铺层层数。

First, it has summarized the two features of BT flow for designing the identification engine later by analyzing and studying the network traffic of a representative P2P system—BitTorrent in the aspects of the flag bit of transport layer, the size of packet, TCP hand-shaking time and the distribution of packet size.

首先本文针对具有典型代表意义的P2P系统—BitTorrent的网络流量进行了传输层标志位、数据流分组尺寸、TCP握手时间和数据流头部分组分布四个方面的分析和研究，总结出了BT流量的两个特征，用于后面识别引擎的设计。

The system consists of mobile pipes and pipe gate on the composition of a number of configurations, including the water hose and opening the outlet with adjustable parts, with the outlet and from the gate, pressure ring, window gates and a four-part group flashboard Cheng, gate spacing and specifications can be ditching the field and the flow configuration space.

该系统由移动管道和管道上配置的多个闸门组成，包括输水软管和开度可调节的配水口等部分，配水口又由闸口、压环、闸窗和闸板四个部分组成，闸门间距及规格可根据田间开沟间距及所需流量配置。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。