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【单选题】
三极管时间继电器通常当控制电路要求精度较高时或（）选用。A.
当电磁式、电动势或空气阻尼式时间继电器不能满足带你路控制要求时
B.
控制回路相互调需无触电输出时
C.
控制回路相互协调需有触电输出时
D.
控制回路需要通电延时输出时
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反馈参考答案：
举一反三
【单选题】Whom is the company making TV films and video programs jointly with?
A.
NBTV
B.
New York customers
C.
Foreign TV crews
D.
Foreign TV and commercial organizations
【简答题】简述正常月经周期中雌孕激素的周期性变化
【单选题】What is the impact of the wide use of digital video recorders on TV advertising?
A.
It has made TV advertising easily accessible to viewers.
B.
It helps advertising to measure the click-through rates.
C.
It has placed TV advertising at a great disadvantage.
D.
It enables viewers to check the sales items with ease.
【单选题】It is unnecessary to turn on the VTR while tuning the TV set to the Video Playback Channel.
A.
Y
B.
N
C.
NG
【简答题】TV video system
【多选题】增进健康可以从哪几个不同方面促进经济增长
A.
健康状况影响个人的劳动市场的表现
B.
促进对自然资源的利用
C.
促进教育收益的实现
D.
减少疾病的直接或间接损失从而促进经济增长
【单选题】What is the impact of the wide use of digital video recorders on TV advertising?
A.
It has made TV advertising easily accessible to viewers
B.
It helps advertisers to measure the click-through rates
C.
It has placed TV advertising at a great disadvantage
D.
It enables viewers to check the sales items with ease
【单选题】The young man is very brave, he often fights ____ the bad man.
A.
to
B.
on
C.
against
D.
For
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