桨的根部使用了高强度塑料夹片, 增加了可靠性和安全性.The grip of the blade is made of high - strength plastic, which improve the reliability and safety.其索具由球头索杯 、 夹片及其O型圈构成.The rigging consists of a ball head line cup, a clamping piece and an O r...
Target function, design variables, nature state restrains, Optimize methods are studied.分析了高土石坝优化设计的目标函数 、 设计变量 、 约束条件及优化方法.Its enlargement factor arrives to 160,000 because it restrains noise effectively.由于选频滤波放大电路对噪声的有...
Badges are also available at a cost of £2.50.徽章也有卖的，2.5英镑一枚。The badges come in twenty different colours and shapes.这种徽章有20种不同的颜色和形状。Mayors wear chains round their necks as badges of office.市长们戴着象征职位的项链....
Blackbirds were sitting at the tops of trees singing.乌鸦停在树梢鸣叫着.Blackbirds and thrushes are songbirds.黑鹂和鸫.The blackbirds were whistling in the garden.山鸟在花园里婉转地鸣叫着....