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Traveling for business can be exhausting, especially if you have to fly internationally over just few days, or go straight to work when you arrive. Still, there are helpful things you can do before, during, and after your flight to make the travel and the transition much easier. Dress Comfortably Loose, comfortable clothing won't restrict your movements. Also don't forget to bring socks and a thin blanket, since new airline cutbacks mean these items might not be provided. Stay away from Salt Avoid foods high in sugar or salt, as they make you tired and dehydrated. Plane food can be hit-or-miss at best, so it is always a good idea to bring some healthy snacks such as energy bars. Recharge Your Batteries Your safest bet is to charge all your electronics before you fly, though an increasing number of airports now offer 'charge stations' where you can plug in. Sleep It Off Try to sleep on the plane if you can. If you have a hard time falling asleep, natural products with velerian root or melatonim (and, of course, standard sleeping pills) can help you. Earplugs, neck pillows, and eye masks can all help as well. Stay away from the Last Rows Aisle or windows is a personal choice, but when you check in and get your seat assignment, it's always a good plan to make sure you're not sitting in the last rows of the plane. Those seats are close to both the engine and the bathrooms, which are noisy and smelly. Paper or Plastic Don't bother taking heavy books on the plane -- go instead with a paperback or magazines. The Kindle or iPad is also a lightweight, compact choice and means easy transitioning between work and pleasure reading.
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【简答题】细胞核由( )、( )、( )三个部分构成
【简答题】已知曲线C的方程是 x 2 m + y 2 =1(m∈R ,且m≠0),给出下面三个命题: ①若曲线C表示圆,则m=1; ②若曲线C表示椭圆,则m的值越大,椭圆的离心率越大; ③若曲线C表示双曲线,则m的值越大,双曲线的离心率越小; 其中正确的命题是______.(填写所有正确命题的序号)
【单选题】以下哪项不正确:( )
A.
细胞是人体结构和功能的基本单位
B.
人体是由几万个细胞构成的
C.
细胞一般由细胞膜、细胞质和细胞核三部分组成
D.
细胞生活在液体的环境里
【单选题】王先生,38岁,司机。由于工作原因憋尿3小时后小便,发现尿中有血丝,由病人陪伴医院就诊。既往体建,吸烟史20年,15支/只。经检验,经确诊为膀胱癌。 完善各项检查后,病人在全麻下行结肠代膀胱术,术后发生尿瘘。关于尿瘘的原因,下列叙述错误的是
A.
吻合口缝合欠佳
B.
造瘘管引流不畅
C.
闭孔反射导致
D.
尿管引流不畅
E.
吻合口血供血
【判断题】设计受弯扭组合变形的圆轴时,应采用分别按弯曲正应力强度条件及扭转切应力强度条件进行轴径设计计算,然后取二者中较大的计算结果值为设计轴的直径。
A.
正确
B.
错误
【简答题】细胞核的结构随着细胞周期的改变细胞核的结构会有相应地变化。在光镜下观察可见间期细胞核的组成由外向内依次是:( )、( )及( )三个部分构成。
【判断题】随着收入的增加,MPC递减,而APC则递增。
A.
正确
B.
错误
【单选题】下列不属于形象玩具的是
A.
动物玩具
B.
棋类玩具
C.
交通玩具
D.
模拟日常用品的玩具
【判断题】设计受弯扭组合变形的圆轴时,应采用分别按弯曲正应力强度条件及扭转切应力强度条件进行轴径设计计算,然后取二者中较大的计算结果值为设计轴的直径。
A.
正确
B.
错误
【单选题】细胞由( )三个部分构成。
A.
细胞膜、细胞壁、细胞核
B.
细胞、细胞壁、细胞核
C.
细胞膜、细胞质、细胞壁
D.
细胞膜、细胞质、细胞核
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