题目内容

预防褥疮的正确方法是()

A. 昏迷、瘫痪病人每日翻身2-3次
B. 给予高蛋白维生素饮食
C. 保持皮肤、床铺干燥清洁
D. 骨突处垫气圈、棉垫
E. 受压部位用石蜡油涂擦并按摩

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沥青胶是由沥青加入()所组成的。

沥青按产源分为()和()两大类。

有人看守道口小心火车牌标志:设在通向道路的右侧,距离铁路道口最外股钢轨不少于20米处,为黑边黄底黑色蒸汽机图案的三角形警告标。

A. 正确
B. 错误

An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes? ()

A. Their bearing is almost constant,even when the true bearing of the contact changes appreciably
B. They always appear on a bearing of 90°From the true bearing of the contact
C. The indirect echoes usually appear in shadow sectors
D. When plotted,their movements are usually abnormal

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