A.测试最大拔出力宜为额定拔出力的20%~80%。B.圆环式拔出仪的拉杆及胀簧材料极限抗拉强度不应小于2000……

未分类题The article consists of three stories about pioneersof fight The first story is about a Chinese named Wan Hu, who made an unsuccessful attermpt at .1in AD.1500 He buit a spaceship powered by 47rockets using. 2 His idea was crazy, but his dreamof fight, 3 500 years later when China successfully launched its first manned Shenzhou V spaceship.The second one is about the Spruce Goose, a_ 4designed to meet the need of 5 troops andmaterials during World War I. It was made entirely of6 and still holds the recordfor，Z Althoughit wasnever put to use, many of its design features have been incorporated into todays 8 The last is about Leonardo da Vincl, the most famous artist of the Renaissance. Apart from his great artistic work, he also drew sketches of.9 with flapping wingscorntrlled and steered by .10 Five hundred years later, a professional parachutist made a successful jump using a wood and canvas parachute based on one of da Vincil s desins sketches.A.human pilots; B.the greatest wingspan; C.cametrue; D.spaceflight;E.wood; F.flying devices;G gunpowder; H.cargo planes;I.transporting; J.flying boat

多项选择题智能网关lan口描述正确的是（）。

A、LAN1口为千兆口
B、LAN2口为千兆口
C、LAN3为机顶盒专用口
D、LAN4口为机顶盒专用口

未分类题对文中最后一段中“也许是我们的生活中昆虫太多的缘故吧，燕子终究要出现的”一句含义及作用的理解，正确的一项是：

单项选择题文章第一段中的“能指”和“所指”分别指的意思是：（）

A．词的表面意义和实际意义。
B．词的外在的意思和内在的意思。
C．表面内容和实际内容。
D．词的书写形式和实质意义。

多项选择题平息旅客投诉的沟通技巧有（）

A、移情法
B、谅解法
C、3F法
D、引导征询法