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【单选题】
以下关于动脉血压的描述,错误的是A.
在安静状态下，我国健康老年人的收缩压为100~120mmHg，舒张压为60~80mmHg。
B.
脉压是指收缩压和舒张压的差值。
C.
平均动脉压并非收缩压和舒张压的平均值。
D.
在临床工作中，通常将上臂测得的肱动脉血压代表动脉血压。
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【单选题】Some teenagers _____ their health because they often expose themselves to so many electric products. [ ]
A.
have damaged
B.
are damaging
C.
damaged
D.
will damage
【单选题】Which of the following methods is often used by advertisers to get us buy their products?
A.
Make us feel dissatisfied with ourselves and our lives.
B.
Make us afraid that people won’t like us if we don’t use the advertised products.
C.
Write different ads for different groups of people.
D.
All of the above.
【简答题】Research and Development Dept.(R&D)
【简答题】What is R&D dept.?
【单选题】在关系模式D(DEPTNO,DEPT,EMPLOYEEN)中,应该选用________为主键(其中DEPTNO表示部门编号,DEPT表示部门名称,EMPLOYEEN为员工人数)。
A.
DEPTNO
B.
DEPT
C.
EMPLOYEEN
D.
D
【单选题】We learn from the text that users of wireless products are more often than not confronted with
A.
missing networks.
B.
technical failures.
C.
wrong standards.
D.
confusing choices.
【简答题】They often choose to advertise their products ______ _______.
【单选题】（ ）products often feature games with learning embedded into them.
A.
Program
B.
Database
C.
Software
D.
Multimedia
【简答题】They often _______(design) ads for food products.
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