环带的

Cycloalkylation of diethyl malonate and ethyl cyanoacetate with alkyl halide was investigated in the presence of toluene.

以甲苯为溶剂及带水剂，用粉末K2CO3代替常规使用的乙醇钠，在季铵盐和聚乙二醇混合相转移催化剂的存在下，含有活泼氢的丙二酸二乙酯和氰乙酸乙酯与二卤代物进行缩合反应，得到相应的环化物。

The quantity of catalyst was equal to 0.6% of feedstocks,the reaction temperature was 78～110 ℃,and the reaction time was 45 min. The test results have shown thatH_4SiW_(12-O_(40)/MCM-48 is an excellent catalyst for synthesizing butanone 1,2-propanediol ketal with its yield reaching over 91.9%.

实验表明：H4SiW12O40/MCM-48是合成丁酮-1，2-丙二醇缩酮的良好催化剂，在n∶n(1，2-丙二醇)=1∶1.6，催化剂用量为反应物料总质量的0.6%，环己烷为带水剂，反应时间45 min的优化条件下，丁酮-1，2-丙二醇缩酮的收率可达91.9%。

Only known species of Cycliophora; lives symbiotically attached to a lobster's lip by an adhesive disk and feeding by means of a hairy mouth ring; its complex life cycle includes asexual and sexual phases.

通过带有粘性的圆盘附着共生在龙虾的唇边，通过带毛的嘴环进食；其复杂的生命周期包括无性繁殖和有性繁殖阶段。

Only known species of Cycliophora; lives symbiotically attached to a lobster's lip by an adhesive disk and feeding by means of a hairy mouth ring; its complex life cycle includes asexual and sexual phases.

通过带有粘性的圆盘附着共生在龙虾的唇边，通过带毛的嘴环进食；其复杂的生命周期包括无性繁殖和有性繁殖阶段。像疯狗一样发疯

More fine and lighter dust particles are fetched into the upper by the upper spiral airflow, forming strong spirally ash hoop at the inside of the top gap and bringing forth the accumulation of the dust particles, then are drawn forth from the upper entrance of special dust insulator, through the lower helical groove of dust insulator, tangential admission to the dust collector from the air return mouth of the dust collector's outside.

较细较轻的灰粒，由上旋涡气流带往上部，在顶盖下面形成强烈旋转的灰环，产生灰粒的集聚，并被从特设的灰尘隔离室上部洞口引出，经过灰尘隔离室的下部螺旋槽，从除尘器外壁回风口切向引入除尘器，筒体下部与内部气流汇合，灰粒被分离而落入灰斗。

Baseband signal can control by serial each that one-chip computer produce phase place , DDS of generator control and bring in realizing, and the phase locking ring of the integration can produce the signal carrier within AD9856 chip, its frequency is set up through the interface of the outside one-chip computer.

基带信号可以由单片机产生的串行码元控制DDS发生器的相位控制端来实现，而AD9856芯片内部集成的锁相环可以产生载波，其频率也是通过外部单片机的接口来设置。

Baseband signal can control by serialeach that one-chip computer produce phase place , DDS of generatorcontrol and bring in realizing, and the phase locking ring of theintegration can produce the signal carrier within AD9856 chip, itsfrequency is set up through the interface of the outside one-chipcomputer.

基带信号可以由单片机产生的串行码元控制DDS发生器的相位控制端来实现，而AD9856芯片内部集成的锁相环可以产生载波，其频率也是通过外部单片机的接口来设置。

Therefore, the calculated results from two numerical computation codes are in good agreement with those from field theory calculation. It has been proved that the applicability of this approach to mode separation research, by contrast, the tested results of mode frequency coming from the Model 2M214 magnetron (double-ring strappings) manufactured by LG Electronic Co.

对于LG 2M214型双环隔模带磁控管，模式分隔度的分析结果与韩国LG公司生产的磁控管实测结果相比较，预测误差仅为0.6%，能够与实际测试结果很好的相符合，预测精度足够高，从而证实了本方法在磁控管谐振系统模式频率分隔特性预测方面的可用性。

The measurements made by Van Allen's experiment led to an unexpected and startling discovery -- an earth-encircling belt of high energy electrons and ions trapped in the magnetosphere now known as the Van Allen Radiation Belt.

Van Allen的实验测得的结果找到了意想不到、令人吃惊的发现—在地球磁气圈外截流了一条环绕地球的高能电子和离子环，现在被称为 Van Allen辐射带。

Based on the analysis of flexural displacement of the circular-shaped cover with a concentric ring or with a concentric ring and topsy-turvy cone, this paper describes the calculating method of displacement and stress in the cricular-shaped cover of DSHE, and the RPDP program for the strength and rigi...

本文通过对带圆环筋平板和有倒锥加强的加筋平板的弯曲变形分析，导出了DSHE大平盖变形和应力的理论计算方法，并在此基础上编制完成了用于DSHE大平盖强度和刚度设计的RPDP程序。第一次使按给定操作参数进行DSHE大平盖设计成为可能。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失