下图表示人的室颤电流与电流持续时间的关系。该图表明,当电流持续时间超过心脏搏动周期时,人的室颤电流约为()。
A.550mA
B.500mA
C.450mA
D.50mA
参考答案:D
Apart from a commercial designer, Andy Warhol worked at several other jobs. Which of the following is NOT one of these jobs().
A.An illustrator.
B.A free-lance writer
C.A publisher.
D.A film-maker.
成员方必须承担的约束和消减补贴义务的为()。
A、“绿箱”措施
B、“黄箱”措施
C、“篮箱”措施