我每次更换后级电子管的时候是不是必须把前级管也一起换？
Do I need to replace my driver tube every time I replace my power tubes?
梯度放大器是核磁共振成像(MRI)系统的核心设备之一，它根据前级控制系统传来的指令，向梯度线圈提供特定波形的电流脉冲。
The gradient amplifier is an essential equipment of Magnetic Resonance Imaging system (MRI). It supplies the gradient coils with pulse currents according to the signal from the control system.
凤凰作为前级远超过我的期望。
与一些音量控制置于输入端的电路不同，这个前级放大器的特征噪声能够随同信号一起衰减。
Any noise characteristic of the preamp circuit is attenuated along with the signal, unlike circuits where the volume control is before the input.
过去五年里，在州级测试中，该校排名位居达拉斯地区所有公立学校的前一二名。
The school has scored at or near the top of all Dallas public schools on state tests for the past five years.
前三个强度级几乎可以区分所有字符。
Almost all characters can be distinguished by the first three strength levels.
在参与事务中的锁超时事件前执行的所有sql语句信息，如语句文本、使用的隔离级、执行顺序等等。
Information about all SQL statements executed before the lock-timeout event in the participating transactions, such as statement text, isolation level used, order of execution, and so on.
保存完好的青铜雕塑属于中国一级国家文物，被认为是模仿了公元前221年统一中国的秦始皇的马车式样。
The well-preserved sculpture, among the top national treasures of China, is believed to be a copy of the personal carriage of the First Emperor of Qin, who in 221 BC unified China for the first time.
甚至日本代表也到会，尽管差不多一个星期前9.0级地震重创了他们的国家。
Even the Japanese delegation made it, despite the 9.0 earthquake that had rocked their country less than a week before.
直到不久前，德国之类一直以拥有AAA级债务评级(收益率也相对较低)为荣的国家，还觉得没有必要讨好全球投资者。
Until recently, countries such as Germany, which have long prided themselves on having a triple a debt rating - and relatively low yields - felt little need to court global investors.
危机前，传统智慧认为无论怎样人们都会竭尽所能保有自己的房子，按揭款的优先级将高于其他债务。
Before the crisis the conventional wisdom had been that people would do whatever they could to stay in their houses, giving priority to mortgage payments over all other forms of debt.
运行队列的前 100 个优先级列表保留给实时任务使用，后 40 个用于用户任务（参见图1）。
The first 100 priority lists of the runqueue are reserved for real-time tasks, and the last 40 are used for user tasks (see Figure 1).
在正在举行的世界卫生大会上，她表示会员国已经要求世卫组织在转到第6级别前考虑到地域传播之外的标准。
She said that at the on-going World Health Assembly, Member States had asked that WHO reflect criteria other than geographical spread before moving to Phase 6.
花旗一级资本比率为12.0%，前一季度为11.3%。
Citigroup's Tier 1 Capital ratio was 12.0% compared to 11.3% in the prior quarter.
这两艘Mistral级舰船的采购合同将于年底前签署。
The procurement contract for two ships of the Mistral-class is to be signed by year-end.
前一节介绍的身份验证方法是用户级安全措施。
The authentication described in the previous section is user-level security.
但人群中的目击者称，他们看到在起火前，该大楼旁边曾燃放大量专业级烟火。
But witnesses in the crowd said they saw a large professional fireworks display next to the building before it caught fire.
前一小节讨论了如何在RequisitePro项目级上进行更新。
The previous section discussed how to update at the RequisitePro project level.
乘法和除法运算符（表3中列出的前四个）具有高于加法和减法的优先级。
The multiplication and division operators (the first four listed in Table 3) have higher precedence than the addition and subtraction operators.
这次地震已有前震，包括两天前在距此25英里远处发生的一次7.2级地震。
The earthquake was preceded by foreshocks, including a 7.2 magnitude earthquake that occurred two days earlier, about 25 miles away.
一级亲缘关系(母亲、姐妹)得过乳癌，特别是绝经期前得过。
Having a first-degree relative (mother, sister) who had breast cancer, especially before she reached menopause.
这次8.9级地震之前曾发生地震学家所说的“前震”，包括周三发生的于周五震中以南约25英里的7.2级地震。
The 8.9 quake was preceded by what seismologists call foreshocks, including a 7.2-magnitude quake that occurred Wednesday, about 25 miles south of Friday's epicenter.
本周三下午4：28，在墨尔本和维州东部的人感受到了4.5级强度的地震，这次震动与12天前的那次相似。
At 4.28pm on Wednesday, a 4.5 magnitude earthquake was felt in Melbourne and eastern Victoria, 12 days after a similar tremor.
两周前，雅虎与微软以及美国在线建立合作伙伴关系，三方可以在彼此的网站上销售各自的“二级”(Class2，意即不太受欢迎的)显示广告。
Last week, Yahoo joined with Microsoft and AOL to form a partnership to sell each others' "Class 2" (that is, not-so-desirable) display ads on each others' sites.
这是十年前的你，还是曾经那个女孩。我坐在七年级的教室里，凝视着外面。
This is you from ten years ago, the same girl that you used to be. I am sitting in my grade seven classroom, staring outside.
她小学六年级辍学，她的前三个孩子和她的情况差不多。
Her education stopped in sixth grade, as did that of her first three children.
十年前，IT的重心常常在雄心勃勃的企业级实现。
A decade ago, the focus of it was often on massively ambitious enterprise-wide roll-outs.
十年前，IT的重心常常在雄心勃勃的企业级实现。
A decade ago, the focus of it was often on massively ambitious enterprise-wide roll-outs.
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