| {{B}}
Please Fasten Your Seatbelts{{/B}} Severe turbulence (湍流) can kill aircraft passengers. Now, in test flights over the Rocky Mountains, NASA (美国航空航天局) engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it. Clear-air turbulence often catches pilots by surprise. Invisible to radar, it is difficult to forecast and can hurl (用力抛出去) passengers about the cabin. In December 1997, one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 metres in a few seconds. However, passengers can avoid serious injury by fastening their seatbelts. "It is the only antidote (对策) for this sort of thing," says Rod Bogue, project manager at NASA’s Dryden Flight Research Center in Edwards, Cal A. A not very rough storm. B. Unexpected disturbed air. C. A kind of visible storm. D. A storm over mountain ridges. [判断题]《铁路旅客运输规程》第20条规定,华侨学生和港澳台学生不回家去境内其他地方旅行观光或探亲访友时，可发售学生票。
A.正确 B.错误 [判断题]信号地线（包括接地体和引接线）与通信地线（包括接地体和引接线）间的距离不宜小于15m。（）
[判断题]（类别：号段管理难度：中等）故障处理原则为先修复故障，后修复业务，先网外，后网内。（）
A.正确 B.错误 [单项选择]牙龈增生、肿胀多见于（）
A. 急性粒细胞白血病 B. 急性单核细胞白血病 C. 红白血病 D. B细胞型急淋白血病 E. T细胞型急淋白血病 [单项选择]少腹坚满，按之疼痛，小便自利，大便色黑易下，神志如狂，时清时乱，口干，漱水不欲咽，舌紫绛，脉细涩。治疗方最宜选用（）。
A. 葛根芩连汤 B. 宣白承气汤 C. 桃仁承气汤 D. 增液承气汤 E. 调胃承气汤 [单选题]钢丝绳做编结连接时,编结长度不应 小于钢丝绳 直径的〈 〉倍。
A.10 B.1 5 C.20 D.25 我来回答: 提交
|
