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1、
The interior of the tube must be kept a hard vacuum to preserve the photo cathode.
显象管内部一定要保证高真空才能保护光电阴极.
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- 相关词组
- mysterious and hard to guess奇妙莫测；奇幻莫测；神秘莫测;
- hard to walk even an inch寸步难移
- be hard upon接近;紧跟着;使…难堪;磨得厉害;
- hard to pronounce拗口;
- hard to get不可多得;
- hard to deal with难办；难打交道；缠手；头难剃;
- torment a person too hard相煎太急;
- hard and tough硬挣;
- practise hard苦练;
- work very hard regardless of weather沐雨栉风
- The people are hard pressed民不堪命;
- hard to speak out难以启齿;
- lead a hard life朝齑暮盐;
- A settled practice is hard to reform积习难改
- try hard to力图；苦心孤诣;
- be hard put to itv.陷入困境;处境尴尬;
- hard to fall asleep好梦难成;
- be hard to explain有口难分;
- hard lot苦命;
- be hard won来之不易;
- 今日热词
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- stout adj.强壮的;结实的;勇敢的;坚定的;n.烈性黑啤酒;胖子;特大号;
- harden vt.使硬化;使经得起考验;使无情;使轮廓鲜明;vi.变硬或更硬;变稳定;变习惯;
- unique adj.唯一的；独一无二的;独特的；罕见的;（某人、地或事物）独具的，特有的n.独一无二的人[物,事实]
- presentation n.授予;提出…的方式;颁奖仪式;介绍;表演;胎儿产式;
- fabric n.织物;布;构造;（建筑物的）结构（如墙、地面、屋顶）：质地;
- diary n.日记，日志;日记簿;
- mecom abbr.marine engine condition monitor(ing) 船舶发动机状况监视;中东电子通讯展;国际通讯展览会;中东国际通讯展览会;国际电子通讯展览会;中东国际电子通讯展览会
- foresee vt.预知，预见;有先见之明;
- bond n.纽带;联系;债券;保释金;v.使结合;建立互信关系;与…紧密联系;与…黏合;
- grill n.(炊具、烤炉内的)烤架;烤肉店;门窗格栅;一盘烧烤食物(尤指烤肉);烤肉餐馆v.烧烤;烧;追问;
- salesman n.男售货员;男推销员;
- sixteenth n.第十六;月的第十六日;十六分之一;adj.第十六的;十六分之一的;
