根据有关法律和公约规定，下列人员中具有签发提单法定权力的人是（）。 ①载货船船长；

以下对结构体类型变量 td 的定义中，错误的是______。

A．

B．

C．

D．

数据字典(DD) 是定义以下哪种系统描述工具中的数据的工具( )。

A．数据流程图

B．系统流程图

C．程序流程图

D．软件结构图

Lisa was running late. Lisa, 25, had a lot to do at work, plus visitors on the way : her parents were coming in for Thanksgiving from her hometown. But as she hurried down the subway stairs, she started to feel uncomfortably warn. By the time she got to the platform, Lisa felt weak and tired—maybe it hadn’t been a good idea to give blood the night before, she thought. She rested herself against a post close to the tracks. Several yards away, Frank, 43, and his girlfriend, Jennifer, found a spot close to where the front of the train would stop. They were deep in discussion about a house they were thinking of buying. But when he heard the scream, followed by someone yelling, "Oh, my God, she fell in!" Frank didn’t hesitate. He jumped down to the tracks and ran some 40 feet toward the body lying on the rails. "No! Not you!" his girlfriend screamed after him. She was right to be alarmed. By the time Frank reached Lisa, he could feel the tracks shaking and see the light coming. The train was about 20 seconds from the station.

It was hard to lift her. She was just out. But he managed to raise her the four feet to the platform so that bystanders could hold her by the grins and drag her away from the edge. That was where Lisa briefly regained consciousness, felt herself being pulled along the ground, and saw someone else holding her purse. Lisa thought she’d been robbed. A woman held her hand and a man gave his shirt to help stop the blood pouring from her head. She tried to talk but she couldn’t, and that was when she realized how much pain she was in. Police and fire officials soon arrived, and Frank told the story to an officer. Jennifer said her boyfriend was calm on their 40 minute train ride downtown—just as he had been seconds after the rescue, which made her think about her reaction at the time. "I saw the train coming and I was thinking he was going to die", she explained.

How did Frank save Lisa（）

A．By lifting her to the platform.

B．By helping her rise to her feet.

C．By pulling her along the ground.

D．By dragging her away from the edg

（）俗名石膏或生石膏，它是一种（）。广泛的用于（）的制作工艺中。

在美国所有捐献的血液中有45%是O型的。由于O型血适用于任何人，所以当在没有时间测定患者是何种血型的危急时刻，O型血是不可缺少的。O型血是唯一可与其他任何血型相融的血型，所以它可以输给任何受血者。然而正是由于这一特殊用途。O型血长期处于短缺状态。
如果上文陈述是正确的，那么下面哪一项也一定能推出( )

A．O型血的特殊用途基于这样一个真实：它与大部分人的血型都相融
B．O型血的供应一直很少，以至于最能体现它有用性的危急时刻，它往往是不够用的
C．只有O型血不能按照危急时刻的需要被快速地测定出来
D．要决定输送任何非O型血时都必须以知道受血者的血型为基础