更多"The use of helium for deep-sea divi"的相关试题:
[单项选择]The use of helium for deep-sea diving
A. helped to overcome the physical discomforts the divers suffered when nitrogen was used.
B. was found by Dr. J. Hildebrand for deep - sea - diving.
C. is now still generally acknowledged as standard practice for deep- sea diving
D. may be thought to contain all the information stated in A, B, and C
[单项选择]Success in diving requires not only skill and balance but also ______ alterness and concentration.
A. mental
B. manual
C. nervous
D. masculine
[单项选择]The Chinese world diving champion was ______ from the national team, which has been front-page reported in the country for several days.
A. displayed
B. dispersed
C. disarmed
D. dismissed
[单项选择]When you do scuba diving, you can ______.
A. stay in deep water for a long time
B. dive very, very deep
C. live in deep water easily
[单项选择]程序中有如下命令序列： SELECT A USE DEM01 SELECT B USE DEM02 SET RELATION T0 RECN0（ ）INTO A SELECT C USE DEM03 SET RELATION T0 RECNO（ ）INTO B SELECT B G0 8 RECNO（ ），RECNO(1)，RECNO(3) 执行此程序段后，屏幕显示的结果是( )。
A. 1 8 8
B. 8 1 8
C. 8 8 1
D. 8 8 8
[单项选择]
现有程序：
USE JZ.DBF
BROWS LAST
USE
则下列描述中，正确的是（）
A. 第一个USE命令的作用是打开数据表
B. 两个USE命令的作用都是关闭数据表
C. 两个USE命令的作用都是打开数据表
D. 第二个USE命令的作用是打开数据表
[单项选择]Communication satellites generally use solar cells as their source of electric power, although some {{U}}test{{/U}} satellites have used thermoelectric generators.
A. superior
B. authorized
C. former
D. experimental
[单项选择]在采用标准UML构建的用例模型（Use-Case Model）中，参与者（Actor）与用例（Use Case）是模型中的主要元素，其中参与者与用例之间可以具有（）关系。
A. 包含（include）
B. 递归（Recursive）
C. 关联（Association）
D. 组合（Composite）
[单项选择]What did the woman use as identification
[单项选择]How has the use of helicopters developed
A. They are taking the place of high-flying jets.
B. They are used for rescue work only.
C. They have been widely used for various purposes.
D. They are now used for commercial purposes.
[单项选择]Some animal rights organizations advocate the use of extreme means in order to ______.
A. wipe out cruel people
B. stop using animals in the laboratory
C. attack hunters in the wild
D. catch full public attention
[单项选择]Use the following probability distribution to calculate the expected return for the portfolio.（）
A. 2.5%
B. 6.6%
C. 4.3%
[单项选择]Designated foreign exchange banks shall use their own funds other than Renminbi fun& to conduct foreign exchange surrender business.
[单项选择]Audiolingual Methodologists use dialogues as the main form of language presentation and______ as the main training techniques.
A. sentence patterns
B. drills
C. sentence analysis
D. language points
[单项选择]Machines that use hydraulic pressure including elevators, dentist chairs, and automobile brakes（）.
A. exclude
B. excluding
C. include
D. are included
