叙述性导语一般分为2-3段，合起来成为 导语区（lead block） . 3) Comparative lead(对比／照式), 把两个人或两件事 情进行对比／对照，用以强调现在的变化。
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lead block test 铅筒试验 ; 铅铸试验
trauzl's lead block test 特劳茨尔试验 ; 特劳则铅铸试验
deck lead block 甲板导索滑车
heel lead block 导索滑车
lead block expansion test 铅柱膨胀试验
Low-melting lead block 低熔点铅挡块
lead block compression test 铅柱压缩试验
low-melting-point lead block 低熔点铅挡块
cargo runner lead block 吊货索导向滑轮
Some distance above the lead block a photographic plate is placed.
在铅块上方某一距离处放一照相底板。
Output factor of lead block fields was related to standard applicators size and lead block fields side;
铅挡野输出因子与标准限光筒和铅挡野大小有关；
The technology for designing the conformal lead block is a part of technique development work of the digital conformal lead block technology.
论文结合数字化射野适形铅模技术的开发，对其中的适形铅模设计技术进行研究。
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